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.
Syntax:
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())            System.out.println(listOfNames.nextElement());          String LoggerName = "GFG";          Logger logger            = Logger.getLogger(LoggerName);          System.out.println("Adding Logger: " + LoggerName);        logManager.addLogger(logger);        listOfNames = logManager.getLoggerNames();          System.out.println("\nUpdated List of Logger Names: ");        while (listOfNames.hasMoreElements())            System.out.println(listOfNames.nextElement());    }} |
Output:
Earlier List of Logger Names: global Adding Logger: GFG Updated List of Logger Names: GFG global
