自己实现lock

package com.hwq.fundamment.Thread;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;

/**
 * @author hwq
 * @date 2019/04/07
 * 

 *手写实现可重入锁,这里只是实现lock,unlock方法
 *
*/

		public class MyLock implements Lock {
	
	    private boolean isLocked = false;
	
	    Thread lockBy = null;
	
	    private int lockCount = 0;
	
	    @Override
	    public synchronized void lock() {
	        Thread currentThread = Thread.currentThread();
	        //第一个进来的线程不让它等待
	        while (isLocked && currentThread != lockBy){
	            try {
	                wait();
	            } catch (InterruptedException e) {
	                e.printStackTrace();
	            }
	            isLocked = true;
	            lockBy = currentThread;
	            lockCount++;
	        }
	    }
	
	    @Override
	    public synchronized void unlock() {
	        if(lockBy == Thread.currentThread()){
	            lockCount--;
	
	            if(lockCount == 0){
	                isLocked = false;
	                notify();
	            }
	        }
	    }
	
	    @Override
	    public void lockInterruptibly() throws InterruptedException {
	
	    }
	
	    @Override
	    public boolean tryLock() {
	        return false;
	    }
	
	    @Override
	    public boolean tryLock(long time, TimeUnit unit) throws InterruptedException {
	        return false;
	    }
	
	    @Override
	    public Condition newCondition() {
	        return null;
	    }
		}



		/**
		 * @author hwq
		 * @date 2019/04/07
		 */
		public class Sequence {
		
		    private MyLock lock = new MyLock();
		
		    private int value;
		
		
		
		    public void a(){
		        lock.lock();
		        System.out.println("a");
		        b();
		        lock.unlock();
		    }
		
		    public void b(){
		        lock.lock();
		        System.out.println("b");
		        lock.unlock();
		    }
		
		    public static void main(String[] args) {
		        Sequence s = new Sequence();
		        new Thread(new Runnable() {
		            @Override
		            public void run() {
		                s.a();
		            }
		        }).start();
		    }