死锁

public class Test_10 {
    public static void main(String[] args) {
        Object object1 = new Object();
        Object object2 = new Object();
        Thread t1 = new Thread(new DeathThread1(object1, object2));
        Thread t2 = new Thread(new DeathThread2(object1, object2));
        t1.start();
        t2.start();
    }
}

class DeathThread1 implements Runnable{
    Object object1;
    Object object2;

    public DeathThread1(Object object1, Object object2) {
        this.object1 = object1;
        this.object2 = object2;
    }

    @Override
    public void run() {
        synchronized (object1) {
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            synchronized (object2){

            }
        }
    }
}

class DeathThread2 implements Runnable{
    Object object1;
    Object object2;

    public DeathThread2(Object object1, Object object2) {
        this.object1 = object1;
        this.object2 = object2;
    }

    @Override
    public void run() {
        synchronized (object2){
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            synchronized (object1){

            }
        }
    }
}