Runtime.getRuntime().addShutdownHook()

package shutdownHookDemo;

public class Demo {

    public static void main(String[] args) {
        System.out.println("hello world");
        Runtime.getRuntime().addShutdownHook(new Thread(){
            @Override
            public void run() {
                System.out.println("程序退出了");
            }
        });
    }
}

hello world
程序退出了