java多线程死锁 moira33的博客(4)

public class BankDemo {
    public static void main(String[] args) {
        Cus c = new Cus();
        new Thread(c).start();
        new Thread(c).start();
    }
}

同步中嵌套同步，用到不同的锁。

public class Test implements Runnable {
    private boolean flag;

    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 {
    static Object locka = new Object();
    static Object lockb = new Object();
}

class DeadLockTest {
    public static void main(String[] args) {
        /*      Thread t1 = new Thread(new Test(true));
                Thread t2 = new Thread(new Test(false));
                t1.start();
                t2.start();  */
        new Thread(new Test(true)).start();//匿名对象，对上面简化
        new Thread(new Test(false)).start();
    }
}

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