Java Thread interrupt（）-执行速度有多快？

Question

How much time does a Thread need to stop/disappear after its interrupt() method has been called?

Consider the following code:

public class MyThread {
    public boolean flag = true;
    public void run() {
        while(flag) {
            doSomething();
            Thread.sleep(20);
        }
    }
}

void foo() {
    MyThread t = new MyThread();
    t.start();
    Thread.sleep(100);
    t.flag = false;
    t.interrupt();
}

Does the assignment t.flag = false; have any effect? In other words, can a thread exit its run() method and terminate "normally" before it is interrupted?

similar question

Answer 1

For sharing data one needs volatile . Better would be to catch the InterruptedException.

public class MyThread {
    public volatile boolean flag = true;
    public void run() {
        try {
            while(flag) {
                doSomething();
                Thread.sleep(20);
            }
        } catch (InterruptedException ie) {
            ...
        }
    }
}

Answer 2

Check agains isInterrupted, anhd throw it again since when it returns true it consumes the message.

public class MyThread {
    public void run() {
        try {
            while(!Thread.isInterrupted()) {
                doSomething();
                Thread.sleep(20);
            }
        } catch (InterruptedException ie) {
            Thread.interrupt();
        }
    }
}

Making the flag unecessary.

If you want to use the flag and finish the code gracefully you don't need to use interrupt and catch the Exception.