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
