isInterrupted方法 主线程输出当前两个线程的状态，输出true/false一直会在变化

Question

package one;

import java.util.Date;
import java.util.*;

public class TestInterrupt {

public static void main(String[] args) {
    Thread1 thread = new Thread1();
    thread.start();
    try {
        Thread.sleep(2000);
    } catch (InterruptedException e) {

    }
    thread.interrupt();

    System.out.println(thread.isInterrupted());
    System.out.println(Thread.interrupted());
    System.out.println(thread.isInterrupted());
}

}
class Thread1 extends Thread {
public void run(){
while(!isInterrupted()){
System.out.println(new Date()+" "+isInterrupted());
try {
sleep(1000);
} catch (InterruptedException e) {
return ;
}finally{
//System.out.println(isInterrupted());
}
}
}

}