The getHandlers() method of the Logger class is used to get the Handlers linked with this logger. Handler is used to taking care of the actual logging. one or more Handler can be added to a Logger. When messages are logged via the Logger, the messages are forwarded to the Handler. This method is helpful for getting an array of all registered Handlers.
Syntax:
public Handler[] getHandlers()
Parameters: This method accepts nothing.
Return value: This method return an array of all registered Handlers.
Below programs illustrate the getHandlers() method:
Program 1:
// Java program to demonstrate// Logger.getHandler() method import java.util.logging.*;import java.io.IOException; public class GFG { public static void main(String[] args) throws SecurityException, IOException { // Create a logger Logger logger = Logger.getLogger( GFG.class.getName()); // Log some logs logger.info("This is message 1"); logger.info("This is message 2"); logger.info("This is message 3"); // Get handler details using getHandler Handler[] handlers = logger.getHandlers(); // Log handler length logger.info("length of Handler " + handlers.length); }} |
Output:
The output printed on eclipse IDE is shown below-
Program 2:
// Java program to demonstrate// Logger.getHandler() method import java.util.logging.*;import java.io.IOException; public class GFG { public static void main(String[] args) throws SecurityException, IOException { // Create a logger Logger logger = Logger.getLogger( GFG.class.getName()); // Set a console Handler logger.addHandler(new ConsoleHandler()); // Get handler details using getHandler Handler[] handlers = logger.getHandlers(); // Print handler details for (int i = 0; i < handlers.length; i++) { System.out.println("Handler details: " + handlers[i].toString()); } }} |
Output:
The output printed on eclipse IDE is shown below-
Reference: https://docs.oracle.com/javase/10/docs/api/java/util/logging/Logger.html#getHandlers()