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LogManager addLogger() method in Java with Examples

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  • Last Updated : 29 Oct, 2019
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The addLogger() method of java.util.logging.LogManager is used to insert the specified Logger in this LogManager instance. This Logger must be a named Logger. This method will add this Logger in this LogManager if it does not exist already. If it exists already, then this method returns false.


public boolean addLogger(Logger logger)

Parameters: This method accepts a parameter logger which is the name of the Logger to be inserted in this LogManager instance, if it does not exist already.

Return Value: This method returns a boolean value false, if this Logger does exist already. Else this method does not return anything.

Exceptions: This method throws NullPointerException if the logger to be added is null.

Below programs illustrate addLogger() method:

// Java program to illustrate
// LogManager addLogger() method
import java.util.logging.*;
import java.util.*;
public class GFG {
    public static void main(String[] args)
        // Create LogManager object
        LogManager logManager
            = LogManager.getLogManager();
        Enumeration<String> listOfNames
            = logManager.getLoggerNames();
        System.out.println("Earlier List of Logger Names: ");
        while (listOfNames.hasMoreElements())
        String LoggerName = "GFG";
        Logger logger
            = Logger.getLogger(LoggerName);
        System.out.println("Adding Logger: " + LoggerName);
        listOfNames = logManager.getLoggerNames();
        System.out.println("\nUpdated List of Logger Names: ");
        while (listOfNames.hasMoreElements())


Earlier List of Logger Names: 

Adding Logger: GFG

Updated List of Logger Names: 


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