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 program to demonstrate
// Logger.removeHandler() method
import 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 program to demonstrate
// Logger.addHandler() method
import 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-
