悟空老师好。在10-3这节中，我出现个问题，代码每次运行结果都是20000

来源：10-3 结果错误

冲哥_

2019-11-15

代码如下：

public class MultiThreadError implements Runnable{
    static MultiThreadError instance = new MultiThreadError();

    int index = 0;

    public static void main(String[] args) throws InterruptedException {

        Thread thread1 = new Thread(instance);
        Thread thread2 = new Thread(instance);
        thread1.start();
        thread2.start();
        thread1.join();
        thread2.join();
        System.out.println(instance.index);
    }

    @Override
    public void run() {
        for (int i = 0; i < 10000; i++) {
            index ++;
        }
    }
}

麻烦老师看下是什么问题

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