多线程之ReentrantLock学习

package com.test;

public interface IBuffer {  
    public void write();  
    public void read() throws InterruptedException;  
}  

package com.test;

import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
public class BufferInterruptibly implements IBuffer {  
  
	//ReentrantLock ：可在一个方法中获取  在令一个方法中释放的锁
    private Lock lock = new ReentrantLock();  
  
    public void write() {  
        lock.lock();  
        try {  
            long startTime = System.currentTimeMillis();  
            System.out.println("开始往这个buff写入数据…");  
            for (;;)// 模拟要处理很长时间  
            {  
                if (System.currentTimeMillis() - startTime > Integer.MAX_VALUE)  
                    break;  
            }  
            System.out.println("终于写完了");  
        } finally {  
            lock.unlock();  
        }  
    }  
  
    public void read() throws InterruptedException{  
    	/**
    	 * lockInterruptibly（）方法，说明该线程调用该read方法时可以被中断，不比等待write方法结束 释放锁
    	 * lock（）方法 说明 read方法 和write 保持同一把锁 ，只有write方法释放该锁 read方法才可操作 否则持续登录 直到获取该锁
    	 */
        lock.lockInterruptibly();// 注意这里，可以响应中断  
        //lock.lock() ;
        try {  
            System.out.println("从这个buff读数据");  
        } finally {  
            lock.unlock();  
        }  
    }  
  
} 

package com.test;

public class Test {  
   public static void main(String[] args) {  
       IBuffer buff = null;  
      
       buff = new BufferInterruptibly();     
       final Writer writer = new Writer(buff);  
       final Reader reader = new Reader(buff);  
       writer.start();  
	   try {
			Thread.sleep(2000) ;
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
       reader.start();  
       new Thread(new Runnable() {  
           public void run() {  
               long start = System.currentTimeMillis();  
               for (;;) {  
                   // 等5秒钟去中断读  
                   if (System.currentTimeMillis() - start > 5000) {  
                       System.out.println("不等了，尝试中断");  
                       reader.interrupt();  
                       break;  
                   }  
 
               }  
               System.out.println("检测终端线程结束");
 
           }  
       }).start();  
   }      
}  
 
   class Writer extends Thread {     
       private IBuffer buff;  
     
       public Writer(IBuffer buff) {  
           this.buff = buff;  
       }  
     
       @Override  
       public void run() {  
    	   System.out.println("write线程开始。。。");
           buff.write();  
           System.out.println("write线程结束！");
       }  
   }  
     
   class Reader extends Thread {  
       private IBuffer buff;  
       public Reader(IBuffer buff) {  
           this.buff = buff;  
       }  
       @Override  
       public void run() {  
           try {  
        	   System.out.println("read线程开始...");
               buff.read();  
           } catch (InterruptedException e) {  
               System.out.println("我不读了");     
           }  
           System.out.println("read结束！");  
       }  
   }  

运行结果：
write线程开始。。。
开始往这个buff写入数据…
read线程开始...
不等了，尝试中断
我不读了
read结束！
检测终端线程结束