java 多线程打印1到75个数

ava线程（使用线程池）交替打印1到75个数的两种解法

2012-12-10 09:53  3153人阅读  评论(2)  收藏  举报

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Java（9） 

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解法一：

 还有另外一个解法：
 package net.liuyx.test;

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

 public class Test {
     private static final int TASK_NUM = 3;
     private static int num = 0;
     private static int flag = 0;
     private static Lock lock = new ReentrantLock();
     private static List list = new ArrayList();
     private static ExecutorService exec = Executors.newCachedThreadPool();
     static {
         for(int i = 0; i < TASK_NUM; i++){
             list.add(lock.newCondition());
         }
     }

     private static void crit() {
         if (num >= 75) {
             System.exit(1);
         }
     }

     private static void print() {
         crit();
         System.out.print(Thread.currentThread());
         for (int i = 0; i < 5; i++) {
             System.out.format("%-2d ", ++num);
         }
         System.out.println();
     }

     private static void work(int i) {
             while (!Thread.interrupted()) {
                 try{
                     lock.lock();
                     if(flag == i){
                         crit();
                         print();
                         flag = (i + 1) % list.size();
                         list.get((i+1)%list.size()).signal();
                     }else{
                         try {
                             list.get(i%list.size()).await();
                         } catch (InterruptedException e) {
                             e.printStackTrace();
                         }
                     }
                 }finally{
                     lock.unlock();
                 }
             }
     }

     private static class Task implements Runnable {
         private final int i;

         public Task(int i) {
             this.i = i;
         }

         @Override
         public void run() {
             work(i);
         }

     }

     /**
      * @param args
      */
     public static void main(String[] args) {
         for (int i = 0; i < list.size(); i++)
             exec.execute(new Task(i));
     }

 }