removeHandler() method of a Logger class is used to remove a log Handler from Logger. A Handler is a component of JVM that takes care of actual logging to the defined output writers like a file, console out etc. It returns silently if the given Handler is not found or is null.
Syntax:
public void removeHandler(Handler handler)
throws SecurityException
Parameters: This method accepts one parameter handler which represents a logging Handler.
Return value: This method returns nothing.
Exception: This method throws SecurityException if a security manager exists, this logger is not anonymous, and the caller does not have LoggingPermission(“control”).
.
Below programs illustrate the removeHandler() method:
Program 1:
Java
// Java program to demonstrate// Logger.removeHandler() methodimport java.util.logging.*;import java.io.IOException;public class GFG { private static Logger logger = Logger.getLogger( GFG.class.getName()); public static void main(String args[]) throws SecurityException, IOException { FileHandler filehandler = new FileHandler("logs.txt"); // Add file handler as // handler of logs logger.addHandler(filehandler); // Log message logger.info("This is Info Message "); // Remove file handler. logger.removeHandler(filehandler); logger.info("This message will " + "not print on filehandler"); }} |
Output:
The output printed on logs.txt file is shown below-
Program 2:
Java
// Java program to demonstrate// Logger.addHandler() methodimport java.util.logging.*;import java.io.IOException;public class GFG { private static Logger logger = Logger.getLogger( GFG.class.getName()); public static void main(String args[]) throws SecurityException, IOException { // Create a ConsoleHandler object ConsoleHandler handler = new ConsoleHandler(); // Add console handler as // handler of logs logger.addHandler(handler); // Log message logger.info("This is Info Message "); // Remove consolehandler logger.removeHandler(handler); // After removing logs print message logger.info("Handler removed"); }} |
Output:
output printed on console output is shown below-
