Java Shutdown Hook

 

Java Shutdown Hook

In Java, a shutdown hook is a thread that is registered with the Java Virtual Machine (JVM) to perform cleanup tasks or release resources when the JVM is shutting down. Shutdown hooks are useful for ensuring that certain operations are executed before the program terminates, regardless of whether it exits normally or due to an unexpected error.

Example 01:

package com.java.Multi_threading;

public class ShutdownHookExample {

public static void main(String[] args) {

// Registering a shutdown hook using Runtime

Runtime.getRuntime().addShutdownHook(new Thread(() -> {

// Code to be executed during shutdown

System.out.println("Shutdown hook executed");

}));

// Rest of your program

System.out.println("Program is running");

// Simulate a program that does some work

for (int i = 0; i < 5; i++) {

System.out.println("Working... " + i);

try {

Thread.sleep(1000);

} catch (InterruptedException e) {

e.printStackTrace();

}

}

// Exiting the program

System.exit(0);

}

}