Java – Runtime.getRuntime().addShutdownHook()

a useful method when program done and run last step task.

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public class AddShutdownHookTest {
 
	static class Message extends Thread {
 
		public void run() {
			System.out.println("Bye.");
		}
	}
 
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		try {
 
			// register Message as shutdown hook
			Runtime.getRuntime().addShutdownHook(new Message());
 
			// print the state of the program
			System.out.println("Program is starting...");
 
			// cause thread to sleep for 3 seconds
			System.out.println("Waiting for 3 seconds...");
			Thread.sleep(3000);
 
			// print that the program is closing
			System.out.println("Program is closing...");
 
		} catch (Exception e) {
			e.printStackTrace();
		}
	}