Aggiunti alcuni esercizi di java.

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Giacomo R. 2023-03-08 19:00:28 +01:00
parent 5bdf6fbb5f
commit c038195ed5
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{
"authors": [
"mikedamay"
],
"files": {
"solution": [
"src/main/java/AnnalynsInfiltration.java"
],
"test": [
"src/test/java/AnnalynsInfiltrationTest.java"
],
"exemplar": [
".meta/src/reference/java/AnnalynsInfiltration.java"
],
"invalidator": [
"build.gradle"
]
},
"forked_from": [
"csharp/annalyns-infiltration"
],
"blurb": "Learn about booleans while helping Annalyn rescue her friend."
}

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{"track":"java","exercise":"annalyns-infiltration","id":"5ffc5d6dd6bd40f69606aa8c183c0b8d","url":"https://exercism.org/tracks/java/exercises/annalyns-infiltration","handle":"GicoProgram","is_requester":true,"auto_approve":false}

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#Tue Mar 07 17:34:54 CET 2023
gradle.version=7.5.1

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# Default ignored files
/shelf/
/workspace.xml

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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
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<option name="modules">
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# Help
## Running the tests
Choose your operating system:
* [Windows](#windows)
* [macOS](#macos)
* [Linux](#linux)
----
1. Open a Command Prompt.
2. Get the first exercise:
```batchfile
C:\Users\JohnDoe>exercism download --exercise hello-world --track java
Not Submitted: 1 problem
java (Hello World) C:\Users\JohnDoe\exercism\java\hello-world
New: 1 problem
java (Hello World) C:\Users\JohnDoe\exercism\java\hello-world
unchanged: 0, updated: 0, new: 1
```
3. Change directory into the exercism:
```batchfile
C:\Users\JohnDoe>cd C:\Users\JohnDoe\exercism\java\hello-world
```
4. Run the tests:
```batchfile
C:\Users\JohnDoe>gradle test
```
*(Don't worry about the tests failing, at first, this is how you begin each exercise.)*
5. Solve the exercise. Find and work through the `instructions.append.md` guide ([view on GitHub](https://github.com/exercism/java/blob/main/exercises/practice/hello-world/.docs/instructions.append.md#tutorial)).
Good luck! Have fun!
----
1. In the terminal window, get the first exercise:
```
$ exercism download --exercise hello-world --track java
New: 1 problem
Java (Etl) /Users/johndoe/exercism/java/hello-world
unchanged: 0, updated: 0, new: 1
```
2. Change directory into the exercise:
```
$ cd /Users/johndoe/exercism/java/hello-world
```
3. Run the tests:
```
$ gradle test
```
*(Don't worry about the tests failing, at first, this is how you begin each exercise.)*
4. Solve the exercise. Find and work through the `instructions.append.md` guide ([view on GitHub](https://github.com/exercism/java/blob/main/exercises/practice/hello-world/.docs/instructions.append.md#tutorial)).
Good luck! Have fun!
----
1. In the terminal window, get the first exercise:
```
$ exercism download --exercise hello-world --track java
New: 1 problem
Java (Etl) /home/johndoe/exercism/java/hello-world
unchanged: 0, updated: 0, new: 1
```
2. Change directory into the exercise:
```
$ cd /home/johndoe/exercism/java/hello-world
```
3. Run the tests:
```
$ gradle test
```
*(Don't worry about the tests failing, at first, this is how you begin each exercise.)*
4. Solve the exercise. Find and work through the `instructions.append.md` guide ([view on GitHub](https://github.com/exercism/java/blob/main/exercises/practice/hello-world/.docs/instructions.append.md#tutorial)).
Good luck! Have fun!
## Submitting your solution
You can submit your solution using the `exercism submit src/main/java/AnnalynsInfiltration.java` command.
This command will upload your solution to the Exercism website and print the solution page's URL.
It's possible to submit an incomplete solution which allows you to:
- See how others have completed the exercise
- Request help from a mentor
## Need to get help?
If you'd like help solving the exercise, check the following pages:
- The [Java track's documentation](https://exercism.org/docs/tracks/java)
- [Exercism's programming category on the forum](https://forum.exercism.org/c/programming/5)
- The [Frequently Asked Questions](https://exercism.org/docs/using/faqs)
Should those resources not suffice, you could submit your (incomplete) solution to request mentoring.
If you need some help you can visit these resources:
* [Stack Overflow](https://stackoverflow.com/questions/tagged/java),
* [The Java subreddit](https://www.reddit.com/r/java),
* [Official Java documentation](https://docs.oracle.com/en/java/javase/11/docs/api/index.html).

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# Hints
## General
- There are three [boolean operators][operators] to work with boolean values.
- Multiple operators can be combined in a single expression.
## 1. Check if a fast attack can be made
- The [boolean operators][operators] can also be applied to boolean parameters.
[operators]: https://docs.oracle.com/javase/tutorial/java/nutsandbolts/opsummary.html

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# Annalyn's Infiltration
Welcome to Annalyn's Infiltration on Exercism's Java Track.
If you need help running the tests or submitting your code, check out `HELP.md`.
If you get stuck on the exercise, check out `HINTS.md`, but try and solve it without using those first :)
## Introduction
Booleans in Java are represented by the `boolean` type, which values can be either `true` or `false`.
Java supports three boolean operators: `!` (NOT), `&&` (AND), and `||` (OR).
## Instructions
In this exercise, you'll be implementing the quest logic for a new RPG game a friend is developing. The game's main character is Annalyn, a brave girl with a fierce and loyal pet dog. Unfortunately, disaster strikes, as her best friend was kidnapped while searching for berries in the forest. Annalyn will try to find and free her best friend, optionally taking her dog with her on this quest.
After some time spent following her best friend's trail, she finds the camp in which her best friend is imprisoned. It turns out there are two kidnappers: a mighty knight and a cunning archer.
Having found the kidnappers, Annalyn considers which of the following actions she can engage in:
- Fast attack: a fast attack can be made if the knight is sleeping, as it takes time for him to get his armor on, so he will be vulnerable.
- Spy: the group can be spied upon if at least one of them is awake. Otherwise, spying is a waste of time.
- Signal prisoner: the prisoner can be signalled using bird sounds if the prisoner is awake and the archer is sleeping, as archers are trained in bird signaling, so they could intercept the message.
- _Free prisoner_: Annalyn can try sneaking into the camp to free the prisoner.
This is a risky thing to do and can only succeed in one of two ways:
- If Annalyn has her pet dog with her she can rescue the prisoner if the archer is asleep.
The knight is scared of the dog and the archer will not have time to get ready before Annalyn and the prisoner can escape.
- If Annalyn does not have her dog then she and the prisoner must be very sneaky!
Annalyn can free the prisoner if the prisoner is awake and the knight and archer are both sleeping, but if the prisoner is sleeping they can't be rescued: the prisoner would be startled by Annalyn's sudden appearance and wake up the knight and archer.
You have four tasks: to implement the logic for determining if the above actions are available based on the state of the three characters found in the forest and whether Annalyn's pet dog is present or not.
## 1. Check if a fast attack can be made
Implement the (_static_) `AnnalynsInfiltration.canFastAttack()` method that takes a boolean value that indicates if the knight is awake. This method returns `true` if a fast attack can be made based on the state of the knight. Otherwise, returns `false`:
```java
boolean knightIsAwake = true;
AnnalynsInfiltration.canFastAttack(knightIsAwake);
// => false
```
## 2. Check if the group can be spied upon
Implement the (_static_) `AnnalynsInfiltration.canSpy()` method that takes three boolean values, indicating if the knight, archer and the prisoner, respectively, are awake. The method returns `true` if the group can be spied upon, based on the state of the three characters. Otherwise, returns `false`:
```java
boolean knightIsAwake = false;
boolean archerIsAwake = true;
boolean prisonerIsAwake = false;
AnnalynsInfiltration.canSpy(knightIsAwake, archerIsAwake, prisonerIsAwake);
// => true
```
## 3. Check if the prisoner can be signalled
Implement the (_static_) `AnnalynsInfiltration.canSignalPrisoner()` method that takes two boolean values, indicating if the archer and the prisoner, respectively, are awake. The method returns `true` if the prisoner can be signalled, based on the state of the two characters. Otherwise, returns `false`:
```java
boolean archerIsAwake = false;
boolean prisonerIsAwake = true;
AnnalynsInfiltration.canSignalPrisoner(archerIsAwake, prisonerIsAwake);
// => true
```
## 4. Check if the prisoner can be freed
Implement the (_static_) `AnnalynsInfiltration.canFreePrisoner()` method that takes four boolean values. The first three parameters indicate if the knight, archer and the prisoner, respectively, are awake. The last parameter indicates if Annalyn's pet dog is present. The method returns `true` if the prisoner can be freed based on the state of the three characters and Annalyn's pet dog presence. Otherwise, it returns `false`:
```java
boolean knightIsAwake = false;
boolean archerIsAwake = true;
boolean prisonerIsAwake = false;
boolean petDogIsPresent = false;
AnnalynsInfiltration.canFreePrisoner(knightIsAwake, archerIsAwake, prisonerIsAwake, petDogIsPresent);
// => false
```
## Source
### Created by
- @mikedamay

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apply plugin: "java"
apply plugin: "eclipse"
apply plugin: "idea"
// set default encoding to UTF-8
compileJava.options.encoding = "UTF-8"
compileTestJava.options.encoding = "UTF-8"
repositories {
mavenCentral()
}
dependencies {
testImplementation "junit:junit:4.13"
testImplementation "org.assertj:assertj-core:3.15.0"
}
test {
testLogging {
exceptionFormat = 'full'
showStandardStreams = true
events = ["passed", "failed", "skipped"]
}
}

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</div>Generated by
<a href="http://www.gradle.org">Gradle 7.5.1</a> at 7 mar 2023, 17:43:04</p>
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<label class="hidden" id="label-for-line-wrapping-toggle" for="line-wrapping-toggle">Wrap lines
<input id="line-wrapping-toggle" type="checkbox" autocomplete="off"/>
</label>
</div>Generated by
<a href="http://www.gradle.org">Gradle 7.5.1</a> at 7 mar 2023, 17:43:04</p>
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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<meta http-equiv="x-ua-compatible" content="IE=edge"/>
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<link href="../css/base-style.css" rel="stylesheet" type="text/css"/>
<link href="../css/style.css" rel="stylesheet" type="text/css"/>
<script src="../js/report.js" type="text/javascript"></script>
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<body>
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</label>
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<?xml version="1.0" encoding="UTF-8"?>
<testsuite name="AnnalynsInfiltrationTest" tests="30" skipped="0" failures="0" errors="0" timestamp="2023-03-07T16:43:04" hostname="giacomo-optiplex3080" time="0.033">
<properties/>
<testcase name="can_spy_if_everyone_but_prisoner_is_sleeping" classname="AnnalynsInfiltrationTest" time="0.026"/>
<testcase name="cannot_release_prisoner_if_only_archer_is_asleep_and_pet_dog_is_absent" classname="AnnalynsInfiltrationTest" time="0.0"/>
<testcase name="cannot_signal_prisoner_if_archer_is_awake_and_prisoner_is_sleeping" classname="AnnalynsInfiltrationTest" time="0.0"/>
<testcase name="cannot_signal_prisoner_if_archer_and_prisoner_are_both_sleeping" classname="AnnalynsInfiltrationTest" time="0.0"/>
<testcase name="cannot_release_prisoner_if_only_knight_is_awake_and_pet_dog_is_absent" classname="AnnalynsInfiltrationTest" time="0.0"/>
<testcase name="cannot_release_prisoner_if_everyone_is_asleep_and_pet_dog_is_absent" classname="AnnalynsInfiltrationTest" time="0.0"/>
<testcase name="cannot_release_prisoner_if_only_prisoner_is_asleep_and_pet_dog_is_present" classname="AnnalynsInfiltrationTest" time="0.0"/>
<testcase name="can_spy_if_only_knight_is_sleeping" classname="AnnalynsInfiltrationTest" time="0.0"/>
<testcase name="cannot_release_prisoner_if_everyone_is_awake_and_pet_dog_is_absent" classname="AnnalynsInfiltrationTest" time="0.0"/>
<testcase name="can_spy_if_everyone_is_awake" classname="AnnalynsInfiltrationTest" time="0.0"/>
<testcase name="can_execute_fast_attack_if_knight_is_sleeping" classname="AnnalynsInfiltrationTest" time="0.0"/>
<testcase name="can_release_prisoner_if_only_archer_is_asleep_and_pet_dog_is_present" classname="AnnalynsInfiltrationTest" time="0.001"/>
<testcase name="can_release_prisoner_if_everyone_is_asleep_and_pet_dog_is_present" classname="AnnalynsInfiltrationTest" time="0.0"/>
<testcase name="can_spy_if_only_archer_is_sleeping" classname="AnnalynsInfiltrationTest" time="0.0"/>
<testcase name="cannot_execute_fast_attack_if_knight_is_awake" classname="AnnalynsInfiltrationTest" time="0.0"/>
<testcase name="cannot_release_prisoner_if_only_archer_is_awake_and_pet_dog_is_absent" classname="AnnalynsInfiltrationTest" time="0.001"/>
<testcase name="can_release_prisoner_if_only_knight_is_awake_and_pet_dog_is_present" classname="AnnalynsInfiltrationTest" time="0.001"/>
<testcase name="cannot_release_prisoner_if_only_knight_is_asleep_and_pet_dog_is_absent" classname="AnnalynsInfiltrationTest" time="0.0"/>
<testcase name="can_release_prisoner_if_only_prisoner_is_awake_and_pet_dog_is_present" classname="AnnalynsInfiltrationTest" time="0.0"/>
<testcase name="can_release_prisoner_if_only_prisoner_is_awake_and_pet_dog_is_absent" classname="AnnalynsInfiltrationTest" time="0.0"/>
<testcase name="can_spy_if_only_prisoner_is_sleeping" classname="AnnalynsInfiltrationTest" time="0.0"/>
<testcase name="cannot_release_prisoner_if_only_knight_is_asleep_and_pet_dog_is_present" classname="AnnalynsInfiltrationTest" time="0.0"/>
<testcase name="cannot_spy_if_everyone_is_sleeping" classname="AnnalynsInfiltrationTest" time="0.0"/>
<testcase name="cannot_release_prisoner_if_only_archer_is_awake_and_pet_dog_is_present" classname="AnnalynsInfiltrationTest" time="0.0"/>
<testcase name="can_signal_prisoner_if_archer_is_sleeping_and_prisoner_is_awake" classname="AnnalynsInfiltrationTest" time="0.0"/>
<testcase name="cannot_release_prisoner_if_everyone_is_awake_and_pet_dog_is_present" classname="AnnalynsInfiltrationTest" time="0.0"/>
<testcase name="can_spy_if_everyone_but_knight_is_sleeping" classname="AnnalynsInfiltrationTest" time="0.001"/>
<testcase name="cannot_release_prisoner_if_only_prisoner_is_asleep_and_pet_dog_is_absent" classname="AnnalynsInfiltrationTest" time="0.0"/>
<testcase name="can_spy_if_everyone_but_archer_is_sleeping" classname="AnnalynsInfiltrationTest" time="0.0"/>
<testcase name="cannot_signal_prisoner_if_archer_and_prisoner_are_both_awake" classname="AnnalynsInfiltrationTest" time="0.0"/>
<system-out><![CDATA[]]></system-out>
<system-err><![CDATA[]]></system-err>
</testsuite>

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distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-7.5.1-bin.zip
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists

240
annalyns-infiltration/gradlew vendored Executable file
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#!/bin/sh
#
# Copyright © 2015-2021 the original authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
##############################################################################
#
# Gradle start up script for POSIX generated by Gradle.
#
# Important for running:
#
# (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
# noncompliant, but you have some other compliant shell such as ksh or
# bash, then to run this script, type that shell name before the whole
# command line, like:
#
# ksh Gradle
#
# Busybox and similar reduced shells will NOT work, because this script
# requires all of these POSIX shell features:
# * functions;
# * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
# «${var#prefix}», «${var%suffix}», and «$( cmd )»;
# * compound commands having a testable exit status, especially «case»;
# * various built-in commands including «command», «set», and «ulimit».
#
# Important for patching:
#
# (2) This script targets any POSIX shell, so it avoids extensions provided
# by Bash, Ksh, etc; in particular arrays are avoided.
#
# The "traditional" practice of packing multiple parameters into a
# space-separated string is a well documented source of bugs and security
# problems, so this is (mostly) avoided, by progressively accumulating
# options in "$@", and eventually passing that to Java.
#
# Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
# and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
# see the in-line comments for details.
#
# There are tweaks for specific operating systems such as AIX, CygWin,
# Darwin, MinGW, and NonStop.
#
# (3) This script is generated from the Groovy template
# https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
# within the Gradle project.
#
# You can find Gradle at https://github.com/gradle/gradle/.
#
##############################################################################
# Attempt to set APP_HOME
# Resolve links: $0 may be a link
app_path=$0
# Need this for daisy-chained symlinks.
while
APP_HOME=${app_path%"${app_path##*/}"} # leaves a trailing /; empty if no leading path
[ -h "$app_path" ]
do
ls=$( ls -ld "$app_path" )
link=${ls#*' -> '}
case $link in #(
/*) app_path=$link ;; #(
*) app_path=$APP_HOME$link ;;
esac
done
APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
APP_NAME="Gradle"
APP_BASE_NAME=${0##*/}
# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
# Use the maximum available, or set MAX_FD != -1 to use that value.
MAX_FD=maximum
warn () {
echo "$*"
} >&2
die () {
echo
echo "$*"
echo
exit 1
} >&2
# OS specific support (must be 'true' or 'false').
cygwin=false
msys=false
darwin=false
nonstop=false
case "$( uname )" in #(
CYGWIN* ) cygwin=true ;; #(
Darwin* ) darwin=true ;; #(
MSYS* | MINGW* ) msys=true ;; #(
NONSTOP* ) nonstop=true ;;
esac
CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
# Determine the Java command to use to start the JVM.
if [ -n "$JAVA_HOME" ] ; then
if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
# IBM's JDK on AIX uses strange locations for the executables
JAVACMD=$JAVA_HOME/jre/sh/java
else
JAVACMD=$JAVA_HOME/bin/java
fi
if [ ! -x "$JAVACMD" ] ; then
die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
else
JAVACMD=java
which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
# Increase the maximum file descriptors if we can.
if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
case $MAX_FD in #(
max*)
MAX_FD=$( ulimit -H -n ) ||
warn "Could not query maximum file descriptor limit"
esac
case $MAX_FD in #(
'' | soft) :;; #(
*)
ulimit -n "$MAX_FD" ||
warn "Could not set maximum file descriptor limit to $MAX_FD"
esac
fi
# Collect all arguments for the java command, stacking in reverse order:
# * args from the command line
# * the main class name
# * -classpath
# * -D...appname settings
# * --module-path (only if needed)
# * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
# For Cygwin or MSYS, switch paths to Windows format before running java
if "$cygwin" || "$msys" ; then
APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
JAVACMD=$( cygpath --unix "$JAVACMD" )
# Now convert the arguments - kludge to limit ourselves to /bin/sh
for arg do
if
case $arg in #(
-*) false ;; # don't mess with options #(
/?*) t=${arg#/} t=/${t%%/*} # looks like a POSIX filepath
[ -e "$t" ] ;; #(
*) false ;;
esac
then
arg=$( cygpath --path --ignore --mixed "$arg" )
fi
# Roll the args list around exactly as many times as the number of
# args, so each arg winds up back in the position where it started, but
# possibly modified.
#
# NB: a `for` loop captures its iteration list before it begins, so
# changing the positional parameters here affects neither the number of
# iterations, nor the values presented in `arg`.
shift # remove old arg
set -- "$@" "$arg" # push replacement arg
done
fi
# Collect all arguments for the java command;
# * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
# shell script including quotes and variable substitutions, so put them in
# double quotes to make sure that they get re-expanded; and
# * put everything else in single quotes, so that it's not re-expanded.
set -- \
"-Dorg.gradle.appname=$APP_BASE_NAME" \
-classpath "$CLASSPATH" \
org.gradle.wrapper.GradleWrapperMain \
"$@"
# Stop when "xargs" is not available.
if ! command -v xargs >/dev/null 2>&1
then
die "xargs is not available"
fi
# Use "xargs" to parse quoted args.
#
# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
#
# In Bash we could simply go:
#
# readarray ARGS < <( xargs -n1 <<<"$var" ) &&
# set -- "${ARGS[@]}" "$@"
#
# but POSIX shell has neither arrays nor command substitution, so instead we
# post-process each arg (as a line of input to sed) to backslash-escape any
# character that might be a shell metacharacter, then use eval to reverse
# that process (while maintaining the separation between arguments), and wrap
# the whole thing up as a single "set" statement.
#
# This will of course break if any of these variables contains a newline or
# an unmatched quote.
#
eval "set -- $(
printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
xargs -n1 |
sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
tr '\n' ' '
)" '"$@"'
exec "$JAVACMD" "$@"

91
annalyns-infiltration/gradlew.bat vendored Normal file
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@rem
@rem Copyright 2015 the original author or authors.
@rem
@rem Licensed under the Apache License, Version 2.0 (the "License");
@rem you may not use this file except in compliance with the License.
@rem You may obtain a copy of the License at
@rem
@rem https://www.apache.org/licenses/LICENSE-2.0
@rem
@rem Unless required by applicable law or agreed to in writing, software
@rem distributed under the License is distributed on an "AS IS" BASIS,
@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@rem See the License for the specific language governing permissions and
@rem limitations under the License.
@rem
@if "%DEBUG%"=="" @echo off
@rem ##########################################################################
@rem
@rem Gradle startup script for Windows
@rem
@rem ##########################################################################
@rem Set local scope for the variables with windows NT shell
if "%OS%"=="Windows_NT" setlocal
set DIRNAME=%~dp0
if "%DIRNAME%"=="" set DIRNAME=.
set APP_BASE_NAME=%~n0
set APP_HOME=%DIRNAME%
@rem Resolve any "." and ".." in APP_HOME to make it shorter.
for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
@rem Find java.exe
if defined JAVA_HOME goto findJavaFromJavaHome
set JAVA_EXE=java.exe
%JAVA_EXE% -version >NUL 2>&1
if %ERRORLEVEL% equ 0 goto execute
echo.
echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
echo.
echo Please set the JAVA_HOME variable in your environment to match the
echo location of your Java installation.
goto fail
:findJavaFromJavaHome
set JAVA_HOME=%JAVA_HOME:"=%
set JAVA_EXE=%JAVA_HOME%/bin/java.exe
if exist "%JAVA_EXE%" goto execute
echo.
echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
echo.
echo Please set the JAVA_HOME variable in your environment to match the
echo location of your Java installation.
goto fail
:execute
@rem Setup the command line
set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
@rem Execute Gradle
"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
:end
@rem End local scope for the variables with windows NT shell
if %ERRORLEVEL% equ 0 goto mainEnd
:fail
rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
rem the _cmd.exe /c_ return code!
set EXIT_CODE=%ERRORLEVEL%
if %EXIT_CODE% equ 0 set EXIT_CODE=1
if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
exit /b %EXIT_CODE%
:mainEnd
if "%OS%"=="Windows_NT" endlocal
:omega

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@ -0,0 +1,17 @@
class AnnalynsInfiltration {
public static boolean canFastAttack(boolean knightIsAwake) {
return !knightIsAwake;
}
public static boolean canSpy(boolean knightIsAwake, boolean archerIsAwake, boolean prisonerIsAwake) {
return (knightIsAwake || archerIsAwake || prisonerIsAwake);
}
public static boolean canSignalPrisoner(boolean archerIsAwake, boolean prisonerIsAwake) {
return (prisonerIsAwake && !archerIsAwake);
}
public static boolean canFreePrisoner(boolean knightIsAwake, boolean archerIsAwake, boolean prisonerIsAwake, boolean petDogIsPresent) {
return ((petDogIsPresent && !archerIsAwake) || (!petDogIsPresent && prisonerIsAwake && !knightIsAwake && !archerIsAwake));
}
}

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@ -0,0 +1,268 @@
import org.junit.Test;
import static org.assertj.core.api.Assertions.assertThat;
public class AnnalynsInfiltrationTest {
@Test
public void cannot_execute_fast_attack_if_knight_is_awake() {
boolean knightIsAwake = true;
assertThat(AnnalynsInfiltration.canFastAttack(knightIsAwake)).isFalse();
}
@Test
public void can_execute_fast_attack_if_knight_is_sleeping() {
boolean knightIsAwake = false;
assertThat(AnnalynsInfiltration.canFastAttack(knightIsAwake)).isTrue();
}
@Test
public void cannot_spy_if_everyone_is_sleeping() {
boolean knightIsAwake = false;
boolean archerIsAwake = false;
boolean prisonerIsAwake = false;
assertThat(AnnalynsInfiltration.canSpy(knightIsAwake, archerIsAwake, prisonerIsAwake)).isFalse();
}
@Test
public void can_spy_if_everyone_but_knight_is_sleeping() {
boolean knightIsAwake = true;
boolean archerIsAwake = false;
boolean prisonerIsAwake = false;
assertThat(AnnalynsInfiltration.canSpy(knightIsAwake, archerIsAwake, prisonerIsAwake)).isTrue();
}
@Test
public void can_spy_if_everyone_but_archer_is_sleeping() {
boolean knightIsAwake = false;
boolean archerIsAwake = true;
boolean prisonerIsAwake = false;
assertThat(AnnalynsInfiltration.canSpy(knightIsAwake, archerIsAwake, prisonerIsAwake)).isTrue();
}
@Test
public void can_spy_if_everyone_but_prisoner_is_sleeping() {
boolean knightIsAwake = false;
boolean archerIsAwake = false;
boolean prisonerIsAwake = true;
assertThat(AnnalynsInfiltration.canSpy(knightIsAwake, archerIsAwake, prisonerIsAwake)).isTrue();
}
@Test
public void can_spy_if_only_knight_is_sleeping() {
boolean knightIsAwake = false;
boolean archerIsAwake = true;
boolean prisonerIsAwake = true;
assertThat(AnnalynsInfiltration.canSpy(knightIsAwake, archerIsAwake, prisonerIsAwake)).isTrue();
}
@Test
public void can_spy_if_only_archer_is_sleeping() {
boolean knightIsAwake = true;
boolean archerIsAwake = false;
boolean prisonerIsAwake = true;
assertThat(AnnalynsInfiltration.canSpy(knightIsAwake, archerIsAwake, prisonerIsAwake)).isTrue();
}
@Test
public void can_spy_if_only_prisoner_is_sleeping() {
boolean knightIsAwake = true;
boolean archerIsAwake = true;
boolean prisonerIsAwake = false;
assertThat(AnnalynsInfiltration.canSpy(knightIsAwake, archerIsAwake, prisonerIsAwake)).isTrue();
}
@Test
public void can_spy_if_everyone_is_awake() {
boolean knightIsAwake = true;
boolean archerIsAwake = true;
boolean prisonerIsAwake = true;
assertThat(AnnalynsInfiltration.canSpy(knightIsAwake, archerIsAwake, prisonerIsAwake)).isTrue();
}
@Test
public void can_signal_prisoner_if_archer_is_sleeping_and_prisoner_is_awake() {
boolean archerIsAwake = false;
boolean prisonerIsAwake = true;
assertThat(AnnalynsInfiltration.canSignalPrisoner(archerIsAwake, prisonerIsAwake)).isTrue();
}
@Test
public void cannot_signal_prisoner_if_archer_is_awake_and_prisoner_is_sleeping() {
boolean archerIsAwake = true;
boolean prisonerIsAwake = false;
assertThat(AnnalynsInfiltration.canSignalPrisoner(archerIsAwake, prisonerIsAwake)).isFalse();
}
@Test
public void cannot_signal_prisoner_if_archer_and_prisoner_are_both_sleeping() {
boolean archerIsAwake = false;
boolean prisonerIsAwake = false;
assertThat(AnnalynsInfiltration.canSignalPrisoner(archerIsAwake, prisonerIsAwake)).isFalse();
}
@Test
public void cannot_signal_prisoner_if_archer_and_prisoner_are_both_awake() {
boolean archerIsAwake = true;
boolean prisonerIsAwake = true;
assertThat(AnnalynsInfiltration.canSignalPrisoner(archerIsAwake, prisonerIsAwake)).isFalse();
}
@Test
public void cannot_release_prisoner_if_everyone_is_awake_and_pet_dog_is_present() {
boolean knightIsAwake = true;
boolean archerIsAwake = true;
boolean prisonerIsAwake = true;
boolean petDogIsPresent = true;
assertThat(AnnalynsInfiltration.canFreePrisoner(knightIsAwake, archerIsAwake,
prisonerIsAwake, petDogIsPresent)).isFalse();
}
@Test
public void cannot_release_prisoner_if_everyone_is_awake_and_pet_dog_is_absent() {
boolean knightIsAwake = true;
boolean archerIsAwake = true;
boolean prisonerIsAwake = true;
boolean petDogIsPresent = false;
assertThat(AnnalynsInfiltration.canFreePrisoner(knightIsAwake, archerIsAwake,
prisonerIsAwake, petDogIsPresent)).isFalse();
}
@Test
public void can_release_prisoner_if_everyone_is_asleep_and_pet_dog_is_present() {
boolean knightIsAwake = false;
boolean archerIsAwake = false;
boolean prisonerIsAwake = false;
boolean petDogIsPresent = true;
assertThat(AnnalynsInfiltration.canFreePrisoner(knightIsAwake, archerIsAwake,
prisonerIsAwake, petDogIsPresent)).isTrue();
}
@Test
public void cannot_release_prisoner_if_everyone_is_asleep_and_pet_dog_is_absent() {
boolean knightIsAwake = false;
boolean archerIsAwake = false;
boolean prisonerIsAwake = false;
boolean petDogIsPresent = false;
assertThat(AnnalynsInfiltration.canFreePrisoner(knightIsAwake, archerIsAwake,
prisonerIsAwake, petDogIsPresent)).isFalse();
}
@Test
public void can_release_prisoner_if_only_prisoner_is_awake_and_pet_dog_is_present() {
boolean knightIsAwake = false;
boolean archerIsAwake = false;
boolean prisonerIsAwake = true;
boolean petDogIsPresent = true;
assertThat(AnnalynsInfiltration.canFreePrisoner(knightIsAwake, archerIsAwake,
prisonerIsAwake, petDogIsPresent)).isTrue();
}
@Test
public void can_release_prisoner_if_only_prisoner_is_awake_and_pet_dog_is_absent() {
boolean knightIsAwake = false;
boolean archerIsAwake = false;
boolean prisonerIsAwake = true;
boolean petDogIsPresent = false;
assertThat(AnnalynsInfiltration.canFreePrisoner(knightIsAwake, archerIsAwake,
prisonerIsAwake, petDogIsPresent)).isTrue();
}
@Test
public void cannot_release_prisoner_if_only_archer_is_awake_and_pet_dog_is_present() {
boolean knightIsAwake = false;
boolean archerIsAwake = true;
boolean prisonerIsAwake = false;
boolean petDogIsPresent = true;
assertThat(AnnalynsInfiltration.canFreePrisoner(knightIsAwake, archerIsAwake,
prisonerIsAwake, petDogIsPresent)).isFalse();
}
@Test
public void cannot_release_prisoner_if_only_archer_is_awake_and_pet_dog_is_absent() {
boolean knightIsAwake = false;
boolean archerIsAwake = true;
boolean prisonerIsAwake = false;
boolean petDogIsPresent = false;
assertThat(AnnalynsInfiltration.canFreePrisoner(knightIsAwake, archerIsAwake,
prisonerIsAwake, petDogIsPresent)).isFalse();
}
@Test
public void can_release_prisoner_if_only_knight_is_awake_and_pet_dog_is_present() {
boolean knightIsAwake = true;
boolean archerIsAwake = false;
boolean prisonerIsAwake = false;
boolean petDogIsPresent = true;
assertThat(AnnalynsInfiltration.canFreePrisoner(knightIsAwake, archerIsAwake,
prisonerIsAwake, petDogIsPresent)).isTrue();
}
@Test
public void cannot_release_prisoner_if_only_knight_is_awake_and_pet_dog_is_absent() {
boolean knightIsAwake = true;
boolean archerIsAwake = false;
boolean prisonerIsAwake = false;
boolean petDogIsPresent = false;
assertThat(AnnalynsInfiltration.canFreePrisoner(knightIsAwake, archerIsAwake,
prisonerIsAwake, petDogIsPresent)).isFalse();
}
@Test
public void cannot_release_prisoner_if_only_knight_is_asleep_and_pet_dog_is_present() {
boolean knightIsAwake = false;
boolean archerIsAwake = true;
boolean prisonerIsAwake = true;
boolean petDogIsPresent = true;
assertThat(AnnalynsInfiltration.canFreePrisoner(knightIsAwake, archerIsAwake,
prisonerIsAwake, petDogIsPresent)).isFalse();
}
@Test
public void cannot_release_prisoner_if_only_knight_is_asleep_and_pet_dog_is_absent() {
boolean knightIsAwake = false;
boolean archerIsAwake = true;
boolean prisonerIsAwake = true;
boolean petDogIsPresent = false;
assertThat(AnnalynsInfiltration.canFreePrisoner(knightIsAwake, archerIsAwake,
prisonerIsAwake, petDogIsPresent)).isFalse();
}
@Test
public void can_release_prisoner_if_only_archer_is_asleep_and_pet_dog_is_present() {
boolean knightIsAwake = true;
boolean archerIsAwake = false;
boolean prisonerIsAwake = true;
boolean petDogIsPresent = true;
assertThat(AnnalynsInfiltration.canFreePrisoner(knightIsAwake, archerIsAwake,
prisonerIsAwake, petDogIsPresent)).isTrue();
}
@Test
public void cannot_release_prisoner_if_only_archer_is_asleep_and_pet_dog_is_absent() {
boolean knightIsAwake = true;
boolean archerIsAwake = false;
boolean prisonerIsAwake = true;
boolean petDogIsPresent = false;
assertThat(AnnalynsInfiltration.canFreePrisoner(knightIsAwake, archerIsAwake,
prisonerIsAwake, petDogIsPresent)).isFalse();
}
@Test
public void cannot_release_prisoner_if_only_prisoner_is_asleep_and_pet_dog_is_present() {
boolean knightIsAwake = true;
boolean archerIsAwake = true;
boolean prisonerIsAwake = false;
boolean petDogIsPresent = true;
assertThat(AnnalynsInfiltration.canFreePrisoner(knightIsAwake, archerIsAwake,
prisonerIsAwake, petDogIsPresent)).isFalse();
}
@Test
public void cannot_release_prisoner_if_only_prisoner_is_asleep_and_pet_dog_is_absent() {
boolean knightIsAwake = true;
boolean archerIsAwake = true;
boolean prisonerIsAwake = false;
boolean petDogIsPresent = false;
assertThat(AnnalynsInfiltration.canFreePrisoner(knightIsAwake, archerIsAwake,
prisonerIsAwake, petDogIsPresent)).isFalse();
}
}

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{
"authors": [
"samuelteixeiras",
"ystromm"
],
"files": {
"solution": [
"src/main/java/BirdWatcher.java"
],
"test": [
"src/test/java/BirdWatcherTest.java"
],
"exemplar": [
".meta/src/reference/java/BirdWatcher.java"
],
"invalidator": [
"build.gradle"
]
},
"forked_from": [
"csharp/bird-watcher"
],
"blurb": "Learn about arrays by keeping track of how many birds visit your garden."
}

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{"track":"java","exercise":"bird-watcher","id":"fe28f433028641dc96ee1cc7c285d8d9","url":"https://exercism.org/tracks/java/exercises/bird-watcher","handle":"GicoProgram","is_requester":true,"auto_approve":false}

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#Tue Mar 07 17:58:10 CET 2023
gradle.version=7.5.1

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bird-watcher/.idea/.gitignore vendored Normal file
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# Default ignored files
/shelf/
/workspace.xml

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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="CompilerConfiguration">
<bytecodeTargetLevel target="11" />
</component>
</project>

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@ -0,0 +1,16 @@
<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="GradleSettings">
<option name="linkedExternalProjectsSettings">
<GradleProjectSettings>
<option name="distributionType" value="DEFAULT_WRAPPED" />
<option name="externalProjectPath" value="$PROJECT_DIR$" />
<option name="modules">
<set>
<option value="$PROJECT_DIR$" />
</set>
</option>
</GradleProjectSettings>
</option>
</component>
</project>

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@ -0,0 +1,20 @@
<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="RemoteRepositoriesConfiguration">
<remote-repository>
<option name="id" value="central" />
<option name="name" value="Maven Central repository" />
<option name="url" value="https://repo1.maven.org/maven2" />
</remote-repository>
<remote-repository>
<option name="id" value="jboss.community" />
<option name="name" value="JBoss Community repository" />
<option name="url" value="https://repository.jboss.org/nexus/content/repositories/public/" />
</remote-repository>
<remote-repository>
<option name="id" value="MavenRepo" />
<option name="name" value="MavenRepo" />
<option name="url" value="https://repo.maven.apache.org/maven2/" />
</remote-repository>
</component>
</project>

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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="ExternalStorageConfigurationManager" enabled="true" />
<component name="ProjectRootManager" version="2" languageLevel="JDK_11" project-jdk-name="11" project-jdk-type="JavaSDK" />
</project>

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bird-watcher/HELP.md Normal file
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# Help
## Running the tests
Choose your operating system:
* [Windows](#windows)
* [macOS](#macos)
* [Linux](#linux)
----
1. Open a Command Prompt.
2. Get the first exercise:
```batchfile
C:\Users\JohnDoe>exercism download --exercise hello-world --track java
Not Submitted: 1 problem
java (Hello World) C:\Users\JohnDoe\exercism\java\hello-world
New: 1 problem
java (Hello World) C:\Users\JohnDoe\exercism\java\hello-world
unchanged: 0, updated: 0, new: 1
```
3. Change directory into the exercism:
```batchfile
C:\Users\JohnDoe>cd C:\Users\JohnDoe\exercism\java\hello-world
```
4. Run the tests:
```batchfile
C:\Users\JohnDoe>gradle test
```
*(Don't worry about the tests failing, at first, this is how you begin each exercise.)*
5. Solve the exercise. Find and work through the `instructions.append.md` guide ([view on GitHub](https://github.com/exercism/java/blob/main/exercises/practice/hello-world/.docs/instructions.append.md#tutorial)).
Good luck! Have fun!
----
1. In the terminal window, get the first exercise:
```
$ exercism download --exercise hello-world --track java
New: 1 problem
Java (Etl) /Users/johndoe/exercism/java/hello-world
unchanged: 0, updated: 0, new: 1
```
2. Change directory into the exercise:
```
$ cd /Users/johndoe/exercism/java/hello-world
```
3. Run the tests:
```
$ gradle test
```
*(Don't worry about the tests failing, at first, this is how you begin each exercise.)*
4. Solve the exercise. Find and work through the `instructions.append.md` guide ([view on GitHub](https://github.com/exercism/java/blob/main/exercises/practice/hello-world/.docs/instructions.append.md#tutorial)).
Good luck! Have fun!
----
1. In the terminal window, get the first exercise:
```
$ exercism download --exercise hello-world --track java
New: 1 problem
Java (Etl) /home/johndoe/exercism/java/hello-world
unchanged: 0, updated: 0, new: 1
```
2. Change directory into the exercise:
```
$ cd /home/johndoe/exercism/java/hello-world
```
3. Run the tests:
```
$ gradle test
```
*(Don't worry about the tests failing, at first, this is how you begin each exercise.)*
4. Solve the exercise. Find and work through the `instructions.append.md` guide ([view on GitHub](https://github.com/exercism/java/blob/main/exercises/practice/hello-world/.docs/instructions.append.md#tutorial)).
Good luck! Have fun!
## Submitting your solution
You can submit your solution using the `exercism submit src/main/java/BirdWatcher.java` command.
This command will upload your solution to the Exercism website and print the solution page's URL.
It's possible to submit an incomplete solution which allows you to:
- See how others have completed the exercise
- Request help from a mentor
## Need to get help?
If you'd like help solving the exercise, check the following pages:
- The [Java track's documentation](https://exercism.org/docs/tracks/java)
- [Exercism's programming category on the forum](https://forum.exercism.org/c/programming/5)
- The [Frequently Asked Questions](https://exercism.org/docs/using/faqs)
Should those resources not suffice, you could submit your (incomplete) solution to request mentoring.
If you need some help you can visit these resources:
* [Stack Overflow](https://stackoverflow.com/questions/tagged/java),
* [The Java subreddit](https://www.reddit.com/r/java),
* [Official Java documentation](https://docs.oracle.com/en/java/javase/11/docs/api/index.html).

38
bird-watcher/HINTS.md Normal file
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# Hints
## General
- The bird count per day is stored in a field named `birdsPerDay`.
- The bird count per day is an array that contains exactly 7 integers.
## 1. Check what the counts were last week
- As we keep the last week we just need to return the last week values.
## 2. Check how many birds visited today
- Remember that the counts are ordered by day from oldest to most recent, with the last element representing today.
- Accessing the last element can be done either by using its (fixed) index (remember to start counting from zero) or by calculating its index using the array's size.
## 3. Increment today's count
- Set the element representing today's count to today's count plus 1.
## 4. Check if there was a day with no visiting birds
- The array can be iterated over using a `for` loop.
- Another solution is to use the Java Stream Api.
## 5. Calculate the number of visiting birds for the first number of days
- A variable can be used to hold the count for the number of visiting birds.
- The array can be iterated over using a `for` loop.
- The variable can be updated inside the loop.
- Remember: arrays are indexed from `0`.
## 6. Calculate the number of busy days
- A variable can be used to hold the number of busy days.
- The array can be iterated over using a `foreach` loop.
- The variable can be updated inside the loop.
- A conditional statement can be used inside the loop.

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bird-watcher/README.md Normal file
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# Bird Watcher
Welcome to Bird Watcher on Exercism's Java Track.
If you need help running the tests or submitting your code, check out `HELP.md`.
If you get stuck on the exercise, check out `HINTS.md`, but try and solve it without using those first :)
## Introduction
In Java, data structures that can hold zero or more elements are known as _collections_. An **array** is a collection that has a fixed size/length and whose elements must all be of the same type. Elements can be assigned to an array or retrieved from it using an index. Java arrays are zero-based, meaning that the first element's index is always zero:
```java
// Declare array with explicit size (size is 2)
int[] twoInts = new int[2];
// Assign second element by index
twoInts[1] = 8;
// Retrieve the second element by index and assign to the int element
int element = twoInts[1];
```
Arrays can also be defined using a shortcut notation that allows you to both create the array and set its value. As the compiler can now tell how many elements the array will have, the length can be omitted:
```java
// Two equivalent ways to declare and initialize an array (size is 3)
int[] threeIntsV1 = new int[] { 4, 9, 7 };
int[] threeIntsV2 = { 4, 9, 7 };
```
Arrays can be manipulated by either calling an array instance's methods or properties, or by using the static methods defined in the `Arrays` class.
The fact that an array is also a _collection_ means that, besides accessing values by index, you can iterate over _all_ its values using a `foreach` loop:
```java
char[] vowels = { 'a', 'e', 'i', 'o', 'u' };
for(char vowel:vowels) {
// Output the vowel
System.out.print(vowel);
}
// => aeiou
```
If you want more control over which values to iterate over, a `for` loop can be used:
```java
char[] vowels = { 'a', 'e', 'i', 'o', 'u' };
for (int i = 0; i < 3; i++) {
// Output the vowel
System.out.print(vowels[i]);
}
// => aei
```
## Instructions
You're an avid bird watcher that keeps track of how many birds have visited your garden in the last seven days.
You have six tasks, all dealing with the numbers of birds that visited your garden.
## 1. Check what the counts were last week
For comparison purposes, you always keep a copy of last week's counts nearby, which were: 0, 2, 5, 3, 7, 8 and 4. Implement the `BirdWatcher.getLastWeek()` method that returns last week's counts:
```java
BirdWatcher.getLastWeek();
// => [0, 2, 5, 3, 7, 8, 4]
```
## 2. Check how many birds visited today
Implement the `BirdWatcher.getToday()` method to return how many birds visited your garden today. The bird counts are ordered by day, with the first element being the count of the oldest day, and the last element being today's count.
```java
int[] birdsPerDay = { 2, 5, 0, 7, 4, 1 };
BirdWatcher birdCount = new BirdWatcher(birdsPerDay);
birdCount.getToday();
// => 1
```
## 3. Increment today's count
Implement the `BirdWatcher.incrementTodaysCount()` method to increment today's count:
```java
int[] birdsPerDay = { 2, 5, 0, 7, 4, 1 };
BirdWatcher birdCount = new BirdWatcher(birdsPerDay);
birdCount.incrementTodaysCount();
birdCount.getToday();
// => 2
```
## 4. Check if there was a day with no visiting birds
Implement the `BirdWatcher.hasDayWithoutBirds()` method that returns `true` if there was a day at which zero birds visited the garden; otherwise, return `false`:
```java
int[] birdsPerDay = { 2, 5, 0, 7, 4, 1 };
BirdWatcher birdCount = new BirdWatcher(birdsPerDay);
birdCount.hasDayWithoutBirds();
// => true
```
## 5. Calculate the number of visiting birds for the first number of days
Implement the `BirdWatcher.getCountForFirstDays()` method that returns the number of birds that have visited your garden from the start of the week, but limit the count to the specified number of days from the start of the week.
```java
int[] birdsPerDay = { 2, 5, 0, 7, 4, 1 };
BirdWatcher birdCount = new BirdWatcher(birdsPerDay);
birdCount.getCountForFirstDays(4);
// => 14
```
## 6. Calculate the number of busy days
Some days are busier that others. A busy day is one where five or more birds have visited your garden.
Implement the `BirdWatcher.getBusyDays()` method to return the number of busy days:
```java
int[] birdsPerDay = { 2, 5, 0, 7, 4, 1 };
BirdWatcher birdCount = new BirdWatcher(birdsPerDay);
birdCount.getBusyDays();
// => 2
```
## Source
### Created by
- @samuelteixeiras
- @ystromm

24
bird-watcher/build.gradle Normal file
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apply plugin: "java"
apply plugin: "eclipse"
apply plugin: "idea"
// set default encoding to UTF-8
compileJava.options.encoding = "UTF-8"
compileTestJava.options.encoding = "UTF-8"
repositories {
mavenCentral()
}
dependencies {
testImplementation "junit:junit:4.13"
testImplementation "org.assertj:assertj-core:3.15.0"
}
test {
testLogging {
exceptionFormat = 'full'
showStandardStreams = true
events = ["passed", "failed", "skipped"]
}
}

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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<meta http-equiv="x-ua-compatible" content="IE=edge"/>
<title>Test results - Class BirdWatcherTest</title>
<link href="../css/base-style.css" rel="stylesheet" type="text/css"/>
<link href="../css/style.css" rel="stylesheet" type="text/css"/>
<script src="../js/report.js" type="text/javascript"></script>
</head>
<body>
<div id="content">
<h1>Class BirdWatcherTest</h1>
<div class="breadcrumbs">
<a href="../index.html">all</a> &gt;
<a href="../packages/default-package.html">default-package</a> &gt; BirdWatcherTest</div>
<div id="summary">
<table>
<tr>
<td>
<div class="summaryGroup">
<table>
<tr>
<td>
<div class="infoBox" id="tests">
<div class="counter">9</div>
<p>tests</p>
</div>
</td>
<td>
<div class="infoBox" id="failures">
<div class="counter">0</div>
<p>failures</p>
</div>
</td>
<td>
<div class="infoBox" id="ignored">
<div class="counter">0</div>
<p>ignored</p>
</div>
</td>
<td>
<div class="infoBox" id="duration">
<div class="counter">0.034s</div>
<p>duration</p>
</div>
</td>
</tr>
</table>
</div>
</td>
<td>
<div class="infoBox success" id="successRate">
<div class="percent">100%</div>
<p>successful</p>
</div>
</td>
</tr>
</table>
</div>
<div id="tabs">
<ul class="tabLinks">
<li>
<a href="#tab0">Tests</a>
</li>
</ul>
<div id="tab0" class="tab">
<h2>Tests</h2>
<table>
<thead>
<tr>
<th>Test</th>
<th>Duration</th>
<th>Result</th>
</tr>
</thead>
<tr>
<td class="success">itHasDayWithoutBirds</td>
<td class="success">0s</td>
<td class="success">passed</td>
</tr>
<tr>
<td class="success">itIncrementTodaysCount</td>
<td class="success">0.001s</td>
<td class="success">passed</td>
</tr>
<tr>
<td class="success">itShouldNotHaveBusyDays</td>
<td class="success">0.027s</td>
<td class="success">passed</td>
</tr>
<tr>
<td class="success">itShouldNotHaveDaysWithoutBirds</td>
<td class="success">0.001s</td>
<td class="success">passed</td>
</tr>
<tr>
<td class="success">itTestGetCountForBusyDays</td>
<td class="success">0s</td>
<td class="success">passed</td>
</tr>
<tr>
<td class="success">itTestGetCountForFirstDays</td>
<td class="success">0s</td>
<td class="success">passed</td>
</tr>
<tr>
<td class="success">itTestGetCountForMoreDaysThanTheArraySize</td>
<td class="success">0s</td>
<td class="success">passed</td>
</tr>
<tr>
<td class="success">itTestGetLastWeek</td>
<td class="success">0.005s</td>
<td class="success">passed</td>
</tr>
<tr>
<td class="success">itTestGetToday</td>
<td class="success">0s</td>
<td class="success">passed</td>
</tr>
</table>
</div>
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<label class="hidden" id="label-for-line-wrapping-toggle" for="line-wrapping-toggle">Wrap lines
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}
ul.linkList {
padding-left: 0;
}
ul.linkList li {
list-style: none;
margin-bottom: 5px;
}

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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<meta http-equiv="x-ua-compatible" content="IE=edge"/>
<title>Test results - Test Summary</title>
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<div class="infoBox" id="tests">
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</thead>
<tbody>
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<td class="success">
<a href="packages/default-package.html">default-package</a>
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<td>9</td>
<td>0</td>
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<td>0.034s</td>
<td class="success">100%</td>
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<th>Duration</th>
<th>Success rate</th>
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<tr>
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<a href="classes/BirdWatcherTest.html">BirdWatcherTest</a>
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<td>9</td>
<td>0</td>
<td>0</td>
<td>0.034s</td>
<td class="success">100%</td>
</tr>
</tbody>
</table>
</div>
</div>
<div id="footer">
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<label class="hidden" id="label-for-line-wrapping-toggle" for="line-wrapping-toggle">Wrap lines
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</div>Generated by
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<?xml version="1.0" encoding="UTF-8"?>
<testsuite name="BirdWatcherTest" tests="9" skipped="0" failures="0" errors="0" timestamp="2023-03-07T17:36:38" hostname="giacomo-optiplex3080" time="0.034">
<properties/>
<testcase name="itShouldNotHaveBusyDays" classname="BirdWatcherTest" time="0.027"/>
<testcase name="itShouldNotHaveDaysWithoutBirds" classname="BirdWatcherTest" time="0.001"/>
<testcase name="itTestGetLastWeek" classname="BirdWatcherTest" time="0.005"/>
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<testcase name="itTestGetCountForBusyDays" classname="BirdWatcherTest" time="0.0"/>
<testcase name="itTestGetCountForFirstDays" classname="BirdWatcherTest" time="0.0"/>
<testcase name="itTestGetToday" classname="BirdWatcherTest" time="0.0"/>
<testcase name="itIncrementTodaysCount" classname="BirdWatcherTest" time="0.001"/>
<testcase name="itTestGetCountForMoreDaysThanTheArraySize" classname="BirdWatcherTest" time="0.0"/>
<system-out><![CDATA[]]></system-out>
<system-err><![CDATA[]]></system-err>
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distributionBase=GRADLE_USER_HOME
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240
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#!/bin/sh
#
# Copyright © 2015-2021 the original authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
##############################################################################
#
# Gradle start up script for POSIX generated by Gradle.
#
# Important for running:
#
# (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
# noncompliant, but you have some other compliant shell such as ksh or
# bash, then to run this script, type that shell name before the whole
# command line, like:
#
# ksh Gradle
#
# Busybox and similar reduced shells will NOT work, because this script
# requires all of these POSIX shell features:
# * functions;
# * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
# «${var#prefix}», «${var%suffix}», and «$( cmd )»;
# * compound commands having a testable exit status, especially «case»;
# * various built-in commands including «command», «set», and «ulimit».
#
# Important for patching:
#
# (2) This script targets any POSIX shell, so it avoids extensions provided
# by Bash, Ksh, etc; in particular arrays are avoided.
#
# The "traditional" practice of packing multiple parameters into a
# space-separated string is a well documented source of bugs and security
# problems, so this is (mostly) avoided, by progressively accumulating
# options in "$@", and eventually passing that to Java.
#
# Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
# and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
# see the in-line comments for details.
#
# There are tweaks for specific operating systems such as AIX, CygWin,
# Darwin, MinGW, and NonStop.
#
# (3) This script is generated from the Groovy template
# https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
# within the Gradle project.
#
# You can find Gradle at https://github.com/gradle/gradle/.
#
##############################################################################
# Attempt to set APP_HOME
# Resolve links: $0 may be a link
app_path=$0
# Need this for daisy-chained symlinks.
while
APP_HOME=${app_path%"${app_path##*/}"} # leaves a trailing /; empty if no leading path
[ -h "$app_path" ]
do
ls=$( ls -ld "$app_path" )
link=${ls#*' -> '}
case $link in #(
/*) app_path=$link ;; #(
*) app_path=$APP_HOME$link ;;
esac
done
APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
APP_NAME="Gradle"
APP_BASE_NAME=${0##*/}
# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
# Use the maximum available, or set MAX_FD != -1 to use that value.
MAX_FD=maximum
warn () {
echo "$*"
} >&2
die () {
echo
echo "$*"
echo
exit 1
} >&2
# OS specific support (must be 'true' or 'false').
cygwin=false
msys=false
darwin=false
nonstop=false
case "$( uname )" in #(
CYGWIN* ) cygwin=true ;; #(
Darwin* ) darwin=true ;; #(
MSYS* | MINGW* ) msys=true ;; #(
NONSTOP* ) nonstop=true ;;
esac
CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
# Determine the Java command to use to start the JVM.
if [ -n "$JAVA_HOME" ] ; then
if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
# IBM's JDK on AIX uses strange locations for the executables
JAVACMD=$JAVA_HOME/jre/sh/java
else
JAVACMD=$JAVA_HOME/bin/java
fi
if [ ! -x "$JAVACMD" ] ; then
die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
else
JAVACMD=java
which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
# Increase the maximum file descriptors if we can.
if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
case $MAX_FD in #(
max*)
MAX_FD=$( ulimit -H -n ) ||
warn "Could not query maximum file descriptor limit"
esac
case $MAX_FD in #(
'' | soft) :;; #(
*)
ulimit -n "$MAX_FD" ||
warn "Could not set maximum file descriptor limit to $MAX_FD"
esac
fi
# Collect all arguments for the java command, stacking in reverse order:
# * args from the command line
# * the main class name
# * -classpath
# * -D...appname settings
# * --module-path (only if needed)
# * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
# For Cygwin or MSYS, switch paths to Windows format before running java
if "$cygwin" || "$msys" ; then
APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
JAVACMD=$( cygpath --unix "$JAVACMD" )
# Now convert the arguments - kludge to limit ourselves to /bin/sh
for arg do
if
case $arg in #(
-*) false ;; # don't mess with options #(
/?*) t=${arg#/} t=/${t%%/*} # looks like a POSIX filepath
[ -e "$t" ] ;; #(
*) false ;;
esac
then
arg=$( cygpath --path --ignore --mixed "$arg" )
fi
# Roll the args list around exactly as many times as the number of
# args, so each arg winds up back in the position where it started, but
# possibly modified.
#
# NB: a `for` loop captures its iteration list before it begins, so
# changing the positional parameters here affects neither the number of
# iterations, nor the values presented in `arg`.
shift # remove old arg
set -- "$@" "$arg" # push replacement arg
done
fi
# Collect all arguments for the java command;
# * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
# shell script including quotes and variable substitutions, so put them in
# double quotes to make sure that they get re-expanded; and
# * put everything else in single quotes, so that it's not re-expanded.
set -- \
"-Dorg.gradle.appname=$APP_BASE_NAME" \
-classpath "$CLASSPATH" \
org.gradle.wrapper.GradleWrapperMain \
"$@"
# Stop when "xargs" is not available.
if ! command -v xargs >/dev/null 2>&1
then
die "xargs is not available"
fi
# Use "xargs" to parse quoted args.
#
# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
#
# In Bash we could simply go:
#
# readarray ARGS < <( xargs -n1 <<<"$var" ) &&
# set -- "${ARGS[@]}" "$@"
#
# but POSIX shell has neither arrays nor command substitution, so instead we
# post-process each arg (as a line of input to sed) to backslash-escape any
# character that might be a shell metacharacter, then use eval to reverse
# that process (while maintaining the separation between arguments), and wrap
# the whole thing up as a single "set" statement.
#
# This will of course break if any of these variables contains a newline or
# an unmatched quote.
#
eval "set -- $(
printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
xargs -n1 |
sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
tr '\n' ' '
)" '"$@"'
exec "$JAVACMD" "$@"

91
bird-watcher/gradlew.bat vendored Normal file
View File

@ -0,0 +1,91 @@
@rem
@rem Copyright 2015 the original author or authors.
@rem
@rem Licensed under the Apache License, Version 2.0 (the "License");
@rem you may not use this file except in compliance with the License.
@rem You may obtain a copy of the License at
@rem
@rem https://www.apache.org/licenses/LICENSE-2.0
@rem
@rem Unless required by applicable law or agreed to in writing, software
@rem distributed under the License is distributed on an "AS IS" BASIS,
@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@rem See the License for the specific language governing permissions and
@rem limitations under the License.
@rem
@if "%DEBUG%"=="" @echo off
@rem ##########################################################################
@rem
@rem Gradle startup script for Windows
@rem
@rem ##########################################################################
@rem Set local scope for the variables with windows NT shell
if "%OS%"=="Windows_NT" setlocal
set DIRNAME=%~dp0
if "%DIRNAME%"=="" set DIRNAME=.
set APP_BASE_NAME=%~n0
set APP_HOME=%DIRNAME%
@rem Resolve any "." and ".." in APP_HOME to make it shorter.
for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
@rem Find java.exe
if defined JAVA_HOME goto findJavaFromJavaHome
set JAVA_EXE=java.exe
%JAVA_EXE% -version >NUL 2>&1
if %ERRORLEVEL% equ 0 goto execute
echo.
echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
echo.
echo Please set the JAVA_HOME variable in your environment to match the
echo location of your Java installation.
goto fail
:findJavaFromJavaHome
set JAVA_HOME=%JAVA_HOME:"=%
set JAVA_EXE=%JAVA_HOME%/bin/java.exe
if exist "%JAVA_EXE%" goto execute
echo.
echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
echo.
echo Please set the JAVA_HOME variable in your environment to match the
echo location of your Java installation.
goto fail
:execute
@rem Setup the command line
set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
@rem Execute Gradle
"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
:end
@rem End local scope for the variables with windows NT shell
if %ERRORLEVEL% equ 0 goto mainEnd
:fail
rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
rem the _cmd.exe /c_ return code!
set EXIT_CODE=%ERRORLEVEL%
if %EXIT_CODE% equ 0 set EXIT_CODE=1
if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
exit /b %EXIT_CODE%
:mainEnd
if "%OS%"=="Windows_NT" endlocal
:omega

View File

@ -0,0 +1,46 @@
class BirdWatcher {
private final int[] birdsPerDay;
public BirdWatcher(int[] birdsPerDay) {
this.birdsPerDay = birdsPerDay.clone();
}
public int[] getLastWeek() {
return birdsPerDay;
}
public int getToday() {
return birdsPerDay[birdsPerDay.length - 1];
}
public void incrementTodaysCount() {
birdsPerDay[birdsPerDay.length - 1]++;
}
public boolean hasDayWithoutBirds() {
for(int dailyVisits : birdsPerDay) {
if(dailyVisits == 0) return true;
}
return false;
}
public int getCountForFirstDays(int numberOfDays) {
int visits = 0;
int days = Math.min(numberOfDays, 7);
for(int i = 0; i < days; i++) {
visits += birdsPerDay[i];
}
return visits;
}
public int getBusyDays() {
int busyDays = 0;
for(int i = 0; i < birdsPerDay.length; i++) {
if(birdsPerDay[i] >= 5) busyDays++;
}
return busyDays;
}
}

View File

@ -0,0 +1,76 @@
import org.junit.Before;
import org.junit.Test;
import static org.assertj.core.api.Assertions.*;
public class BirdWatcherTest {
private static final int DAY1 = 0;
private static final int DAY2 = 2;
private static final int DAY3 = 5;
private static final int DAY4 = 3;
private static final int DAY5 = 7;
private static final int DAY6 = 8;
private static final int TODAY = 4;
private BirdWatcher birdWatcher;
private int lastWeek[] = {DAY1, DAY2, DAY3, DAY4, DAY5, DAY6, TODAY};
@Before
public void setUp() {
birdWatcher = new BirdWatcher(lastWeek);
}
@Test
public void itTestGetLastWeek() {
assertThat(birdWatcher.getLastWeek())
.containsExactly(DAY1, DAY2, DAY3, DAY4, DAY5, DAY6, TODAY);
}
@Test
public void itTestGetToday() {
assertThat(birdWatcher.getToday()).isEqualTo(TODAY);
}
@Test
public void itIncrementTodaysCount() {
birdWatcher.incrementTodaysCount();
assertThat(birdWatcher.getToday()).isEqualTo(TODAY + 1);
}
@Test
public void itHasDayWithoutBirds() {
assertThat(birdWatcher.hasDayWithoutBirds()).isTrue();
}
@Test
public void itShouldNotHaveDaysWithoutBirds() {
birdWatcher = new BirdWatcher(new int[]{1, 2, 5, 3, 7, 8, 4});
assertThat(birdWatcher.hasDayWithoutBirds()).isFalse();
}
@Test
public void itTestGetCountForFirstDays() {
assertThat(birdWatcher.getCountForFirstDays(4)).isEqualTo(DAY1 + DAY2 + DAY3 + DAY4);
}
@Test
public void itTestGetCountForMoreDaysThanTheArraySize() {
assertThat(birdWatcher.getCountForFirstDays(10))
.isEqualTo(DAY1 + DAY2 + DAY3 + DAY4 + DAY5 + DAY6 + TODAY);
}
@Test
public void itTestGetCountForBusyDays() {
// DAY3, DAY5 and DAY6 are all >= 5 birds
assertThat(birdWatcher.getBusyDays()).isEqualTo(3);
}
@Test
public void itShouldNotHaveBusyDays() {
birdWatcher = new BirdWatcher(new int[]{1, 2, 3, 3, 2, 1, 4});
assertThat(birdWatcher.getBusyDays()).isEqualTo(0);
}
}

View File

@ -0,0 +1,23 @@
{
"authors": [
"TalesDias"
],
"files": {
"solution": [
"src/main/java/CarsAssemble.java"
],
"test": [
"src/test/java/CarsAssembleTest.java"
],
"exemplar": [
".meta/src/reference/java/CarsAssemble.java"
],
"invalidator": [
"build.gradle"
]
},
"forked_from": [
"csharp/cars-assemble"
],
"blurb": "Learn about numbers by analyzing the production of an assembly line."
}

View File

@ -0,0 +1 @@
{"track":"java","exercise":"cars-assemble","id":"3353b6bdeea34aa0958f060388a65c56","url":"https://exercism.org/tracks/java/exercises/cars-assemble","handle":"GicoProgram","is_requester":true,"auto_approve":false}

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