学步园

package com.oyqh;  
  
public class RunnableTest implements Runnable {  
    private int flag = 1;  
    private Object obj1 = new Object(), obj2 = new Object();  
  
    public void run() {  
        System.out.println("flag=" + flag);  
        if (flag == 1) {  
            synchronized (obj1) {  
                System.out.println("我已经锁定obj1，休息0.5秒后锁定obj2去！");  
                try {  
                    Thread.sleep(500);  
                } catch (InterruptedException e) {  
                    e.printStackTrace();  
                }  
                synchronized (obj2) {  
                    System.out.println("1");  
                }  
            }  
        }  
        if (flag == 0) {  
            synchronized (obj2) {  
                System.out.println("我已经锁定obj2，休息0.5秒后锁定obj1去！");  
                try {  
                    Thread.sleep(500);  
                } catch (InterruptedException e) {  
                    e.printStackTrace();  
                }  
                synchronized (obj1) {  
                    System.out.println("0");  
                }  
            }  
        }  
    }  
  
    public static void main(String[] args) {  
        RunnableTest run01 = new RunnableTest();  
        RunnableTest run02 = new RunnableTest();  
        run01.flag = 1;  
        run02.flag = 0;  
        Thread thread01 = new Thread(run01);  
        Thread thread02 = new Thread(run02);  
        System.out.println("线程开始喽！");  
        thread01.start();  
        thread02.start();  
    }  
}  

上述代码实际运行时并不会产生死锁现象，若要死锁，则需要将 private Object obj1 = new Object(), obj2 = new Object(); 

改为 private static Object obj1 = new Object(), obj2 = new Object();