一天一代码 ：Java线基础程通讯2

001 import java.util.concurrent.locks.* ;
002
003 class ThreadDemo2
004 {
005     public static void main ( String [] args)
006     {
007         Resource res = new Resource ();
008
009         Producer pro = new Producer ( res);
010         Consumer con = new Consumer ( res);
011        
012         Thread t1 = new Thread( pro);
013         Thread t2 = new Thread( pro);
014         Thread t3 = new Thread( con);
015         Thread t4 = new Thread( con);
016
017         t1 . start();
018         t2 . start();
019         t3 . start();
020         t4 . start();
021     }
022 }
023
024 class Resource
025 {
026     String name;
027     int count = 1;
028     boolean flag = false;
029     private Lock lock = new ReentrantLock();
030     private Condition condition_pro = lock . newCondition();
031     private Condition condition_con = lock . newCondition();
032
033     public void set( String name) throws InterruptedException
034     {
035         lock . lock();
036         try
037         {
038             while( flag)
039                 condition_pro . await();
040             this . name = name + "......" + count ++;
041
042             System . out . println( Thread . currentThread (). getName ()+ "...生产者.." + this . name);
043             flag = true;
044             condition_con . signal();
045         }
046         finally
047         {
048             lock . unlock();
049         }
050
051     }
052
053     public void out() throws InterruptedException
054     {
055         lock . lock();
056         try
057         {
058             while (! flag)
059                 condition_con . await();
060             System . out . println( Thread . currentThread (). getName ()+ "...消费者.." + this . name);
061             flag = false;
062             condition_pro . signal();
063         }
064         finally
065         {
066             lock . unlock();
067         }
068     }
069 }
070
071 class Producer implements Runnable
072 {
073     private Resource res;
074
075     Producer( Resource res)
076     {
077         this . res = res;
078     }
079     public void run()
080     {
081         while( true)
082         {
083             try
084             {
085                 res . set( "+商品+");
086             }
087             catch ( InterruptedException e)
088             {
089             }
090         }
091     }
092
093 }
094
095 class Consumer implements Runnable
096 {
097     private Resource res;
098
099     Consumer( Resource res)
100     {
101         this . res = res;
102     }
103     public void run()
104     {
105         while( true)
106         {
107             try
108             {
109                 res . out();
110             }
111             catch ( InterruptedException e)
112             {
113             }
114         }
115     }
116 }
[/font]