70 lines
2.0 KiB
Markdown
70 lines
2.0 KiB
Markdown
# Log Levels
|
|
|
|
Welcome to Log Levels 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
|
|
|
|
A `String` in Java is an object that represents immutable text as a sequence of Unicode characters (letters, digits, punctuation, etc.). Double quotes are used to define a `String` instance:
|
|
|
|
```java
|
|
String fruit = "Apple";
|
|
```
|
|
|
|
Strings are manipulated by calling the string's methods. Once a string has been constructed, its value can never change. Any methods that appear to modify a string will actually return a new string.
|
|
The `String` class provides some _static_ methods to transform the strings.
|
|
|
|
## Instructions
|
|
|
|
In this exercise you'll be processing log-lines.
|
|
|
|
Each log line is a string formatted as follows: `"[<LEVEL>]: <MESSAGE>"`.
|
|
|
|
There are three different log levels:
|
|
|
|
- `INFO`
|
|
- `WARNING`
|
|
- `ERROR`
|
|
|
|
You have three tasks, each of which will take a log line and ask you to do something with it.
|
|
|
|
## 1. Get message from a log line
|
|
|
|
Implement the (_static_) `LogLevels.message()` method to return a log line's message:
|
|
|
|
```java
|
|
LogLevels.message("[ERROR]: Invalid operation")
|
|
// => "Invalid operation"
|
|
```
|
|
|
|
Any leading or trailing white space should be removed:
|
|
|
|
```java
|
|
LogLevels.message("[WARNING]: Disk almost full\r\n")
|
|
// => "Disk almost full"
|
|
```
|
|
|
|
## 2. Get log level from a log line
|
|
|
|
Implement the (_static_) `LogLevels.logLevel()` method to return a log line's log level, which should be returned in lowercase:
|
|
|
|
```java
|
|
LogLevels.logLevel("[ERROR]: Invalid operation")
|
|
// => "error"
|
|
```
|
|
|
|
## 3. Reformat a log line
|
|
|
|
Implement the (_static_) `LogLevels.reformat()` method that reformats the log line, putting the message first and the log level after it in parentheses:
|
|
|
|
```java
|
|
LogLevels.reformat("[INFO]: Operation completed")
|
|
// => "Operation completed (info)"
|
|
```
|
|
|
|
## Source
|
|
|
|
### Created by
|
|
|
|
- @mirkoperillo |