import java.util.Date;

public class Test {
    public static Long obj1 = new Long(0);
    public static Long obj2 = new Long(0);

    public static void main(String[] args) {
        LockAa la = new LockAa();
        new Thread(la).start();
        LockBb lb = new LockBb();
        new Thread(lb).start();
    }
}

class LockAa implements Runnable {
    public void run() {
        try {
            System.out.println(new Date().toString() + " LockA 开始执行");
            while (true) {
                synchronized (Test.obj1) {
//                                        Test.obj1 = Test.obj1 / 10 * 10 + 10;
                    System.out.println(new Date().toString() + " LockA 锁住 obj1" + Test.obj1);
                    Thread.sleep(5000);

                    synchronized (Test.obj2) {
//                                                Test.obj2 = Test.obj2 / 10 * 10 + 10;
                        System.out.println(new Date().toString() + " LockA 锁住 obj2" + Test.obj2);
                        Thread.sleep(5000); // do something
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

class LockBb implements Runnable {
    public void run() {
        try {
            System.out.println(new Date().toString() + " LockB 开始执行");
            while (true) {
                synchronized (Test.obj2) {
//                                        Test.obj2 += 5;
                    System.out.println(new Date().toString() + " LockB 锁住 obj2" + Test.obj2);
                    Thread.sleep(5000);

                    synchronized (Test.obj1) {
//                                                Test.obj1 += 5;
                        System.out.println(new Date().toString() + " LockB 锁住 obj1" + Test.obj1);
                        Thread.sleep(5000); // do something
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}