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Learning Exercise
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.
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:
INFOWARNINGERRORYou have three tasks, each of which will take a log line and ask you to do something with it.
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"
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"
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)"
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