Java Security Exit program------Close Hooks

Test code:

public class Testhook {

public static boolean hookFlag = false;public static void main(String[] args) {    Thread shutDownThread = new Thread() {        public void run() {            TestHook.hookFlag = true;            try {                Thread.sleep(5000);            } catch (InterruptedException e) {                e.printStackTrace();            }            System.out.println("hook success!"+TestHook.hookFlag);        }    };    Runtime.getRuntime().addShutdownHook(shutDownThread);    System.out.println("hook init" + TestHook.hookFlag);    while(!TestHook.hookFlag) {        try {            Thread.sleep(1000);            System.out.println("没安全退出");        } catch (InterruptedException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }    System.out.println("安全退出");}

}

Execute command KILL [PID]

Operation Result:

Java Security Exit program------Close Hooks