程序代码：

public class TestDeadLock implements Runnable {
    public int flag = 1;
    static Object o1 = new Object(), o2 = new Object();   //这两个静态Object对象存放在内存的哪一块区域？ 静态区域不是只能存放字符串常量和静态变量吗？
    public void run() {
System.out.println("flag=" + flag);
        if(flag == 1) {
            synchronized(o1) {
                try {
                    Thread.sleep(500);
                } catch (Exception e) {
                    e.printStackTrace();
                }
                synchronized(o2) {
                    System.out.println("1");    
                }
            }
        }
        if(flag == 0) {
            synchronized(o2) {
                try {
                    Thread.sleep(500);
                } catch (Exception e) {
                    e.printStackTrace();
                }
                synchronized(o1) {
                    System.out.println("0");
                }
            }
        }
    }    
    
    public static void main(String[] args) {
        TestDeadLock td1 = new TestDeadLock();         //td1.o1是否和td2.o1指的是同一个Object ？
        TestDeadLock td2 = new TestDeadLock();
        td1.flag = 1;
        td2.flag = 0;
        Thread t1 = new Thread(td1);                    
        Thread t2 = new Thread(td2);
        t1.start();
        t2.start();
        
    }
}