This is an example of how to use Conditional logging. Using conditional logging in a Class means that we check theLevel for which theLogger is enabled before we log a message to that level. We have implemented a Class that uses a logger. The Class consists of a simple method that uses the logger to log messages after checking the logging level. The basic steps of the example are:

• Create a Class and create a new logger instance for the Class.
• Create a new instance of the class and invoke its method. The method has a simple functionality.
• In the beggining and at the end of the method check if the logger level is set to INFO. If so, use theinfo(String msg) API method to log a message.

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;import java.util.Date; public class ConditionalLoggingExample {    private Logger logger = Logger.getLogger(ConditionalLoggingExample.class.getName());     public static void main(String[] args) {      ConditionalLoggingExample example = new ConditionalLoggingExample();  example.Method();    }      public void Method() {  // Check if the logging level before enter into the log  if (logger.isLoggable(Level.INFO)) {logger.info("Entering executeMethod() at : " + new Date());  }   // Method functionality  for (int i = 0; i< 5; i++) {for (int j = 0; j< 5; j++) {    System.out.print(i + j + " ");}System.out.println("");  }   if (logger.isLoggable(Level.INFO)) {logger.info("Exiting executeMethod() at  : " + new Date());  }    }}

Output:

Αυγ 12, 2012 1:45:55 ΜΜ com.javacodegeeks.snippets.core.ConditionalLoggingExample MethodINFO: Entering executeMethod() at : Sun Aug 12 13:45:55 EEST 20120 1 2 3 4 1 2 3 4 5 2 3 4 5 6 3 4 5 6 7 4 5 6 7 8 Αυγ 12, 2012 1:45:55 ΜΜ com.javacodegeeks.snippets.core.ConditionalLoggingExample MethodINFO: Exiting executeMethod() at  : Sun Aug 12 13:45:55 EEST 2012

 
This was an example of how to use Conditional logging in Java.

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