Aggiunti alcuni esercizi di java.

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{
"authors": [
"ystromm"
],
"contributors": [
"mirkoperillo"
],
"files": {
"solution": [
"src/main/java/NeedForSpeed.java"
],
"test": [
"src/test/java/NeedForSpeedTest.java"
],
"exemplar": [
".meta/src/reference/java/NeedForSpeed.java"
],
"invalidator": [
"build.gradle"
]
},
"blurb": "Learn about classes by creating cars."
}

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{"track":"java","exercise":"need-for-speed","id":"eff51292680746ad86b0fa691827a53d","url":"https://exercism.org/tracks/java/exercises/need-for-speed","handle":"GicoProgram","is_requester":true,"auto_approve":false}

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#Wed Mar 08 17:50:06 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">
<component name="CompilerConfiguration">
<bytecodeTargetLevel target="11" />
</component>
</project>

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<option name="name" value="Maven Central repository" />
<option name="url" value="https://repo1.maven.org/maven2" />
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<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/" />
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<option name="id" value="MavenRepo" />
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<option name="url" value="https://repo.maven.apache.org/maven2/" />
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<?xml version="1.0" encoding="UTF-8"?>
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<component name="ProjectRootManager" version="2" languageLevel="JDK_11" project-jdk-name="11" project-jdk-type="JavaSDK" />
</project>

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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/NeedForSpeed.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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need-for-speed/HINTS.md Normal file
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# Hints
## 1. Creating a remote controlled car
- [Define a constructor][constructor-syntax] that has two `int` parameters.
- Store the two parameters as [fields][fields] to access them from the classes' methods.
## 2. Creating a race track
- [Define a constructor][constructor-syntax] that has one `int` parameter.
- Store the parameter as a [field][fields] to access it from the class' method.
## 3. Drive the car
- Add a [field][fields] to keep track of the distance driven.
- Add the car's speed to the [field][fields] that keeps track of the distance driven.
## 4. Check for a drained battery
- Add a [field][fields] to keep track of the remaining battery charge percentage (starts at 100%).
- Remove the car's battery drain from the [field][fields] to keep track of the battery charge.
- Don't update the distance driven if the battery is drained.
- Remember that if the battery charge is less than the battery drain percentage, it is considered drained.
## 5. Create the Nitro remote control car
- [Instantiate][instance-constructors] an instance of the `RemoteControlCar` with the correct arguments.
## 6. Check if a remote control car can finish a race
- Solving this is probably best done by [repeatedly driving the car][while].
- Remember that the car has a method to retrieve the distance it has driven.
- Consider what to do when the battery has been drained before reaching the finish line.
[constructor-syntax]: https://docs.oracle.com/javase/tutorial/java/javaOO/constructors.html
[instance-constructors]: https://docs.oracle.com/javase/tutorial/java/javaOO/objectcreation.html
[while]: https://docs.oracle.com/javase/tutorial/java/nutsandbolts/while.html
[fields]: https://docs.oracle.com/javase/tutorial/java/javaOO/variables.html

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# Need for Speed
Welcome to Need for Speed 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
Creating an instance of a _class_ is done by calling its _constructor_ through the `new` operator. A constructor is a special type of method whose goal is to initialize a newly created instance. Constructors look like regular methods, but without a return type and with a name that matches the classes' name.
```java
class Library {
private int books;
public Library() {
// Initialize the books field
this.books = 10;
}
}
// This will call the constructor
var library = new Library();
```
Like regular methods, constructors can have parameters. Constructor parameters are usually stored as (private) fields to be accessed later, or else used in some one-off calculation. Arguments can be passed to constructors just like passing arguments to regular methods.
```java
class Building {
private int numberOfStories;
private int totalHeight;
public Building(int numberOfStories, double storyHeight) {
this.numberOfStories = numberOfStories;
this.totalHeight = numberOfStories * storyHeight;
}
}
// Call a constructor with two arguments
var largeBuilding = new Building(55, 6.2);
```
## Instructions
In this exercise you'll be organizing races between various types of remote controlled cars. Each car has its own speed and battery drain characteristics.
Cars start with full (100%) batteries. Each time you drive the car using the remote control, it covers the car's speed in meters and decreases the remaining battery percentage by its battery drain.
If a car's battery is below its battery drain percentage, you can't drive the car anymore.
Each race track has its own distance. Cars are tested by checking if they can finish the track without running out of battery.
You have six tasks, each of which will work with remote controller car instances.
## 1. Creating a remote controlled car
Allow creating a remote controller car by defining a constructor for the `NeedForSpeed` class that takes the speed of the car in meters and the battery drain percentage as its two parameters (both of type `int`):
```java
int speed = 5;
int batteryDrain = 2;
var car = new NeedForSpeed(speed, batteryDrain);
```
## 2. Creating a race track
Allow creating a race track by defining a constructor for the `RaceTrack` class that takes the track's distance in meters as its sole parameter (which is of type `int`):
```java
int distance = 800;
var raceTrack = new RaceTrack(distance);
```
## 3. Drive the car
Implement the `NeedForSpeed.drive()` method that updates the number of meters driven based on the car's speed. Also implement the `NeedForSpeed.distanceDriven()` method to return the number of meters driven by the car:
```java
int speed = 5;
int batteryDrain = 2;
var car = new NeedForSpeed(speed, batteryDrain);
car.drive();
car.distanceDriven();
// => 5
```
## 4. Check for a drained battery
Update the `NeedForSpeed.drive()` method to drain the battery based on the car's battery drain. Also implement the `NeedForSpeed.batteryDrained()` method that indicates if the battery is drained:
```java
int speed = 5;
int batteryDrain = 2;
var car = new NeedForSpeed(speed, batteryDrain);
car.drive();
car.batteryDrained();
// => false
```
## 5. Create the Nitro remote control car
The best-selling remote control car is the Nitro, which has a stunning top speed of 50 meters with a battery drain of 4%. Implement the (static) `NeedForSpeed.nitro()` method to return this type of car:
```java
var car = NeedForSpeed.nitro();
car.drive();
car.distanceDriven();
// => 50
```
## 6. Check if a remote control car can finish a race
To finish a race, a car has to be able to drive the race's distance. This means not draining its battery before having crossed the finish line. Implement the `RaceTrack.tryFinishTrack()` method that takes a `NeedForSpeed` instance as its parameter and returns `true` if the car can finish the race; otherwise, return `false`. To see if the car can finish the race, you should try to drive the car until either you reach the end of the track or the battery drains:
```java
int speed = 5;
int batteryDrain = 2;
var car = new NeedForSpeed(speed, batteryDrain);
int distance = 100;
var race = new RaceTrack(distance);
car.distanceDriven()
// => 0
race.tryFinishTrack(car);
// => true
car.distanceDriven()
// => 100
## Source
### Created by
- @ystromm
### Contributed to by
- @mirkoperillo

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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 NeedForSpeedTest</title>
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<link href="../css/style.css" rel="stylesheet" type="text/css"/>
<script src="../js/report.js" type="text/javascript"></script>
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<h1>Class NeedForSpeedTest</h1>
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<a href="../index.html">all</a> &gt;
<a href="../packages/default-package.html">default-package</a> &gt; NeedForSpeedTest</div>
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<p>duration</p>
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<td class="success">0s</td>
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<td class="success">0s</td>
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<td class="success">0s</td>
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<td class="success">0s</td>
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<td class="success">0s</td>
<td class="success">passed</td>
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<td class="success">0s</td>
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<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 8 mar 2023, 18:00:53</p>
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</div>
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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>
<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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<h1>Test Summary</h1>
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</li>
<li>
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function findChildElements(container, name, targetClass) {
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// Entry point.
window.onload = function() {
initTabs();
initControls();
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} (window, window.document));

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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 - Default package</title>
<link href="../css/base-style.css" rel="stylesheet" type="text/css"/>
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<a href="../index.html">all</a> &gt; default-package</div>
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<div class="counter">14</div>
<p>tests</p>
</div>
</td>
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<p>failures</p>
</div>
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<p>ignored</p>
</div>
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<div class="counter">0.032s</div>
<p>duration</p>
</div>
</td>
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</td>
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<div class="infoBox success" id="successRate">
<div class="percent">100%</div>
<p>successful</p>
</div>
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</li>
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<h2>Classes</h2>
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<?xml version="1.0" encoding="UTF-8"?>
<testsuite name="NeedForSpeedTest" tests="14" skipped="0" failures="0" errors="0" timestamp="2023-03-08T17:00:53" hostname="giacomo-optiplex3080" time="0.034">
<properties/>
<testcase name="new_remote_control_car_has_not_driven_any_distance" classname="NeedForSpeedTest" time="0.032"/>
<testcase name="drive_until_battery_is_drained" classname="NeedForSpeedTest" time="0.0"/>
<testcase name="nitro_car_has_battery_not_drained" classname="NeedForSpeedTest" time="0.0"/>
<testcase name="new_remote_control_car_battery_is_not_drained" classname="NeedForSpeedTest" time="0.0"/>
<testcase name="car_can_finish_with_car_that_just_cannot_finish" classname="NeedForSpeedTest" time="0.0"/>
<testcase name="drive_increases_distance_driven_with_speed" classname="NeedForSpeedTest" time="0.0"/>
<testcase name="car_can_finish_with_car_that_can_easily_finish" classname="NeedForSpeedTest" time="0.0"/>
<testcase name="drive_does_not_increase_distance_driven_when_battery_drained" classname="NeedForSpeedTest" time="0.0"/>
<testcase name="nitro_has_correct_battery_drain" classname="NeedForSpeedTest" time="0.0"/>
<testcase name="car_can_finish_with_car_that_can_just_finish" classname="NeedForSpeedTest" time="0.0"/>
<testcase name="nitro_car_has_correct_speed" classname="NeedForSpeedTest" time="0.0"/>
<testcase name="nitro_car_has_not_driven_any_distance" classname="NeedForSpeedTest" time="0.0"/>
<testcase name="car_can_finish_with_car_that_cannot_finish" classname="NeedForSpeedTest" time="0.0"/>
<testcase name="drive_to_almost_drain_battery" classname="NeedForSpeedTest" 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
need-for-speed/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
need-for-speed/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 +1,48 @@
class NeedForSpeed {
private int speed;
private int batteryDrain;
private int driven;
private int percent;
public NeedForSpeed(int speed, int batteryDrain) {
this.speed = speed;
this.batteryDrain = batteryDrain;
driven = 0;
percent = 100;
}
public boolean batteryDrained() {
return percent < batteryDrain;
}
public int distanceDriven() {
return driven;
}
public void drive() {
if(!batteryDrained()) {
driven += speed;
percent -= batteryDrain;
}
}
public static NeedForSpeed nitro() {
return new NeedForSpeed(50, 4);
}
}
class RaceTrack {
private int distance;
public RaceTrack(int distance) {
this.distance = distance;
}
public boolean tryFinishTrack(NeedForSpeed car) {
while(!car.batteryDrained()) {
car.drive();
}
return car.distanceDriven() >= distance;
}
}

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@ -0,0 +1,163 @@
import static org.assertj.core.api.Assertions.assertThat;
import org.junit.Test;
public class NeedForSpeedTest {
@Test
public void new_remote_control_car_has_not_driven_any_distance() {
int speed = 10;
int batteryDrain = 2;
var car = new NeedForSpeed(speed, batteryDrain);
assertThat(car.distanceDriven()).isEqualTo(0);
}
@Test
public void drive_increases_distance_driven_with_speed() {
int speed = 5;
int batteryDrain = 1;
var car = new NeedForSpeed(speed, batteryDrain);
car.drive();
assertThat(car.distanceDriven()).isEqualTo(5);
}
@Test
public void drive_does_not_increase_distance_driven_when_battery_drained() {
int speed = 9;
int batteryDrain = 50;
var car = new NeedForSpeed(speed, batteryDrain);
// Drain the battery
car.drive();
car.drive();
// One extra drive attempt (should not succeed)
car.drive();
assertThat(car.distanceDriven()).isEqualTo(18);
}
@Test
public void new_remote_control_car_battery_is_not_drained() {
int speed = 15;
int batteryDrain = 3;
var car = new NeedForSpeed(speed, batteryDrain);
assertThat(car.batteryDrained()).isFalse();
}
@Test
public void drive_to_almost_drain_battery() {
int speed = 2;
int batteryDrain = 1;
var car = new NeedForSpeed(speed, batteryDrain);
// Almost drain the battery
for (var i = 0; i < 99; i++) {
car.drive();
}
assertThat(car.batteryDrained()).isFalse();
}
@Test
public void drive_until_battery_is_drained() {
int speed = 2;
int batteryDrain = 1;
var car = new NeedForSpeed(speed, batteryDrain);
// Drain the battery
for (var i = 0; i < 100; i++) {
car.drive();
}
assertThat(car.batteryDrained()).isTrue();
}
@Test
public void nitro_car_has_not_driven_any_distance() {
var car = NeedForSpeed.nitro();
assertThat(car.distanceDriven()).isEqualTo(0);
}
@Test
public void nitro_car_has_battery_not_drained() {
var car = NeedForSpeed.nitro();
assertThat(car.batteryDrained()).isFalse();
}
@Test
public void nitro_car_has_correct_speed() {
var car = NeedForSpeed.nitro();
car.drive();
assertThat(car.distanceDriven()).isEqualTo(50);
}
@Test
public void nitro_has_correct_battery_drain() {
var car = NeedForSpeed.nitro();
// The battery is almost drained
for (var i = 0; i < 24; i++) {
car.drive();
}
assertThat(car.batteryDrained()).isFalse();
// Drain the battery
car.drive();
assertThat(car.batteryDrained()).isTrue();
}
@Test
public void car_can_finish_with_car_that_can_easily_finish() {
int speed = 10;
int batteryDrain = 2;
var car = new NeedForSpeed(speed, batteryDrain);
int distance = 100;
var race = new RaceTrack(distance);
assertThat(race.tryFinishTrack(car)).isTrue();
}
@Test
public void car_can_finish_with_car_that_can_just_finish() {
int speed = 2;
int batteryDrain = 10;
var car = new NeedForSpeed(speed, batteryDrain);
int distance = 20;
var race = new RaceTrack(distance);
assertThat(race.tryFinishTrack(car)).isTrue();
}
@Test
public void car_can_finish_with_car_that_just_cannot_finish() {
int speed = 3;
int batteryDrain = 20;
var car = new NeedForSpeed(speed, batteryDrain);
int distance = 16;
var race = new RaceTrack(distance);
assertThat(race.tryFinishTrack(car)).isFalse();
}
@Test
public void car_can_finish_with_car_that_cannot_finish() {
int speed = 1;
int batteryDrain = 20;
var car = new NeedForSpeed(speed, batteryDrain);
int distance = 678;
var race = new RaceTrack(distance);
assertThat(race.tryFinishTrack(car)).isFalse();
}
}