史上最难的一道Java面试题

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无意中了解到如下题目，觉得蛮好，准备拿来分析分析。

题目如下：

public class TestSync2 implements Runnable {    int b = 100;    synchronized void m1() throws InterruptedException {        b = 1000;        Thread.sleep(500);        System.out.println("b=" + b);    }    synchronized void m2() throws InterruptedException {        Thread.sleep(250);        b = 2000;    }    public static void main(String[] args) throws InterruptedException {        TestSync2 tt = new TestSync2();        Thread t = new Thread(tt);        t.start();        tt.m2();        System.out.println("main thread b=" + tt.b);    }    @Override    public void run() {        try {            m1();        } catch (InterruptedException e) {            e.printStackTrace();        }    }}

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