With this example we are going to demonstrate how to set aLogger‘s log level. TheLevel defines a set of standard logging levels that can be used to control logging output. The standard levels are provided at theLevel API. In short, to set logger log level you should:

• Create a newLogger instance.
• Set the log level toLevel.INFO, with thesetLevel(Level newLevel) API method.
• Log aSEVERE message, with thesevere(String msg) API method. The message will be logged, since the level is set toINFO.
• Set the log level toLevel.SEVERE, with thesetLevel(Level newLevel) API method.
• Log aWARNING message, with thewarning(String msg) API method. The message will not be logged, since the level is set toSEVERE.
• Set the log level toLevel.OFF, with thesetLevel(Level newLevel) API method, to turn the logger off. Now no messages will be logged.
• Set the log level toLevel.ALL, with thesetLevel(Level newLevel) API method, to turn the logger on. Now all messages will be logged.

Let’s take a look at the code snippet that follows:

package com.javacodegeeks.snippets.core;import java.util.logging.Logger;import java.util.logging.Level; public class LogLevelExample {        // Create logger instance    private static Logger logger = Logger.getLogger(LogLevelExample.class.getName());     public static void main(String[] args) {    // Set the log level to Level.INFO  logger.setLevel(Level.INFO);  logger.severe("This message will be logged.");   // Set the log level to Level.SEVERE  logger.setLevel(Level.SEVERE);  logger.warning("This message won't be logged.");   // Turn of the log  logger.setLevel(Level.OFF);  logger.info("All log is turned off.");   // Turn the logger on  logger.setLevel(Level.ALL);  logger.info("Information message.");  logger.warning("Warning message.");  logger.severe("Severe message.");    }}

Output:

Αυγ 12, 2012 1:03:32 ΜΜ com.javacodegeeks.snippets.core.LogLevelExample mainSEVERE: This message will be logged.Αυγ 12, 2012 1:03:32 ΜΜ com.javacodegeeks.snippets.core.LogLevelExample mainINFO: Information message.Αυγ 12, 2012 1:03:32 ΜΜ com.javacodegeeks.snippets.core.LogLevelExample mainWARNING: Warning message.Αυγ 12, 2012 1:03:32 ΜΜ com.javacodegeeks.snippets.core.LogLevelExample mainSEVERE: Severe message

 
This was an example of how to set a logger’s log Level in Java.

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