JAVA基础线程控制遇到一点小问题

Question

你好，运行时，输入了Q但是程序没有退出还在一直执行，是什么原因，蒙圈

```java
package homework;

import java.util.Scanner;

/**
 * @author 小池
 * @version 1.0
 */
public class HomeWork01 {
    public static void main(String[] args) {
        A a = new A();
        a.start();
        B b = new B();
        Thread thread = new Thread(b);
        thread.start();

    }
}

class A extends Thread {
   private static boolean loop = true;

    public static boolean isLoop() {
        return loop;
    }

    public static void setLoop(boolean loop) {
        A.loop = loop;
    }

    @Override
    public void run() {
        while (loop) {
            for (int i = 0; i < 100; i++) {
                System.out.println((int) (Math.random() * 100+1));
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

class B implements Runnable {
    Scanner scanner = new Scanner(System.in);

    @Override
    public void run() {
        for (;;) {
            System.out.println("是否要中断A线程的运行？ 请输入选择 Q:中断");
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            char c = scanner.next().toUpperCase().charAt(0);
            if (c=='Q') {
                A.setLoop(false);
                break;
            }
        }
    }
}

```

Answer 1

我寄已找到解决方法了，因为多写了个for，把它去掉就好了，我真的超级棒耶