java-exercism-exercises/log-levels

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:

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:

LogLevels.message("[ERROR]: Invalid operation")
// => "Invalid operation"

Any leading or trailing white space should be removed:

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:

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:

LogLevels.reformat("[INFO]: Operation completed")
// => "Operation completed (info)"

Source

Created by

• @mirkoperillo