lock和Condition

主要相同点：Lock能完成synchronized所实现的所有功能，同时 lock性能上高于synchronized
主要不同点：Lock有比synchronized更精确的线程语义和更好的性能。synchronized会自动释放锁，而Lock一定要求程序员手工释放，并且必须在finally从句中释放。
另外，Synchronized---对象加锁，Lock---基于栈中的框架，而不是具体的某个对象，只需要在栈里设置锁的开始和结束就行，不用关心大小对象的变化...、

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;



public class TestThread{
	
	private final static Lock lock = new ReentrantLock();
    private final static Condition produced = lock.newCondition();
    private final Condition consumed = lock.newCondition();
    boolean available = false;
    static int k=100;
	public static void main(String[] args){
		/*lock.lock();
		try{
			for(int i=3;i>0;i--){
				System.out.println("------"+i+"-----");
				produced.await(3,TimeUnit.SECONDS);
			}
		} catch (InterruptedException e) {
			e.printStackTrace();
		}finally{
			lock.unlock();
		}*/
		final TestThread t = new TestThread();
		Thread proTh = new Thread(){
				public void run(){
					try {
						t.produce();
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}
			};
		Thread cusTh = new Thread(){
				public void run(){
					try {
						t.consume();
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}
			};
		ExecutorService service = Executors.newCachedThreadPool();

		service.submit(cusTh);
		for(int i=3;i>0;i--){
			service.submit(proTh);
		}
		service.shutdown();
	}
	
	/**
	 * 生产者
	 * @throws InterruptedException
	 */
     public void produce() throws InterruptedException  {

           lock.lock();
           try {
                 /*if(available){
                	// produced.await(); //放弃lock进入睡眠 
                	 System.out.println("-------------");
                	 consumed.signal();
                	 produced.await();
                 }*/
        	   	 System.out.println("-----start------");
        	     //consumed.signal();
            	// produced.await(10,TimeUnit.SECONDS);
        	   	 Thread.sleep(1000);
        	     //consumed.signal(); //发信号唤醒等待这个condition的线程
                 /*生产苹果*/
                 System.out.println("apple produced.");
                 available = true;
                 System.out.println("produce----->k="+k);
 				 k--;
           } finally {
                 lock.unlock();
           }
     }
     /**
      * 消费者
      * @throws InterruptedException
      */
     public synchronized void consume() throws InterruptedException {

           //lock.lock();
          // try {
               /* if(!available){
                	System.out.println("1111111111");
                	produced.signal();
                	consumed.await();//放弃lock进入睡眠
                	 //Thread.sleep(1000);
                 }*/
        	    // consumed.await(5,TimeUnit.SECONDS);
        	   Thread.sleep(5000);
                 /*吃苹果*/
                 System.out.println("apple consumed.");
                 available = false;
                 //produced.signal();//发信号唤醒等待这个condition的线程
                 System.out.println("consume----->k="+k);
 				 k--;
 				/* } finally {
                 lock.unlock();
           }*/

     }      
}