多线程的安全问题-死锁示例

class Test implements Runnable {
    private boolean flag;
    public Test(boolean flag) {
        this.flag = flag;
    }
    
    public void run() {
        if (flag) {
            while (true) {
                synchronized(MyLock.locka) {
                    System.out.println(Thread.currentThread().getName()+"..if   locka....");
                    synchronized(MyLock.lockb) {                        
                        System.out.println(Thread.currentThread().getName()+"..if   lockb....");
                    }
                }
            }
        }else {
            while(true)    {                    
                synchronized(MyLock.lockb) {
                    System.out.println(Thread.currentThread().getName()+"..else  lockb....");
                    synchronized(MyLock.locka) {
                        System.out.println(Thread.currentThread().getName()+"..else   locka....");
                    }
                }
            }    
        }
    }
}

class MyLock {
    public static final Object locka = new Object();
    public static final Object lockb = new Object();
}


public class DeadLock {
    public static void main(String[] args) {
        Test a = new Test(true);
        Test b = new Test(false);

        Thread t1 = new Thread(a);
        Thread t2 = new Thread(b);
        t1.start();
        t2.start();
    }
}