JAVA concurrent programming 5

Description: Code first, and notes will be added later. 
public class LockTest1 { 
    /** 
     * Lock nesting will cause deadlock 
     * Avoid 1. Try not to write lock nesting 2. Lock nesting order (both call getLock method) 3. Introduce timeout mechanism 
     */ 
    //Display lock Lock, reentrant lock 
    // interruptible lock, Lock is, interruptible 
    // fair lock, synchronized is a random lock, unfair 
    // optimistic lock, pessimistic lock database level 
    Lock lock = new ReentrantLock(); 

    /** 
     * Read on readerLock and write on WriteLock 
     */ 
    ReentrantReadWriteLock readWriteLock = new ReentrantReadWriteLock(); 

    //lock locka lockb 
    private Object locka = new Object(); 
    private Object lockb = new Object(); 

    public static void main(String[] args) { 
        new LockTest1().deadLock(); 
    } 
    /**
     * 嵌套锁
     */
    private void deadLock(){
        Thread thread1 = new Thread(new Runnable() {
            @Override
            public void run() {
                getLock();
//                synchronized (locka){
//                    try {
//                        System.out.println(Thread.currentThread().getName()+"获取A锁！");
//                        Thread.sleep(500);
//                        System.out.println(Thread.currentThread().getName()+"睡眠500ms");
//                    } catch (InterruptedException e) {
//                        e.printStackTrace();
//                    }
//                    System.out.println(Thread.currentThread().getName()+"需要B锁");
//                    synchronized (lockb){
//                        System.out.println(Thread.currentThread().getName()+"B锁中！");
//                    }
//                }
            }
        },"thread1");

        Thread thread2 = new Thread(new Runnable() {
            @Override
            public void run() {
                getLock();
//                synchronized (lockb){
//                    try {
//                        System.out.println(Thread.currentThread().getName()+"获取B锁！");
//                        Thread.sleep(500);
//                        System.out.println(Thread.currentThread().getName()+"睡眠500ms");
//                    } catch (InterruptedException e) {
//                        e.printStackTrace();
//                    }
//                    System.out.println(Thread.currentThread().getName()+"需要A锁");
//                    synchronized (locka){
//                        System.out.println(Thread.currentThread().getName()+"A锁中！");
//                    }
//                }
            }
        },"thread2");

        thread1.start();
        thread2.start();
    }

    public void getLock(){
        synchronized (locka){
            try {
                System.out.println(Thread.currentThread().getName()+"获取A锁！");
                Thread.sleep(500);
                System.out.println(Thread.currentThread().getName()+"睡眠500ms");
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println(Thread.currentThread().getName()+"需要B锁");
            synchronized (lockb){
                System.out.println(Thread.currentThread().getName()+"B锁中！");
            }
        }
    }
}