Logger: Logger is the class of java.util.logging package that extends the Object class. Java provides logging APIs like: Logger, Level, Handler etc. for implementing logging features in your java application.

What is Logging Level?

     

Logger: Logger is the class of java.util.logging package that extends the Object class. Java provides logging APIs like: Logger, Level, Handler etc. for implementing logging features in your java application.  It is a part of J2SE (Java 2 Standard  Edition). When you go to create java logging program then first of all need a Logger object. The Logger object contains log messages. Logger has one or more handler that performs log records. A logger object used for logging messages for individual system or an application component that can be derived by getLogger methods. Java logging provides a way to contain multiple types of message like: warning, info, severe etc. for an application. These information or messages can be used for many purposes but it is specially used for debugging, troubleshooting and auditing.

There are following levels in descending order:

1. SEVERE(Greater level) : This level shows log a SEVERE message.
2. WARNING: This level shows log a WARNING message.
3. INFO: This level shows log a INFO message.
4. CONFIG: This level shows log a CONFIG message.
5. FINE: This level has log a FINE message.
6. FINER: This level has log a FINER message.
7. FINEST (Smallest level): This level has log a FINEST message.

Additional levels:

• OFF  : This is a special type of level that assists to turn off logging.
• ALL  : This level illustrates all logging messages that are enabled.

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