发布于 2016-07-29 23:25:20 | 129 次阅读 | 评论: 0 | 来源: 网友投递

这里有新鲜出炉的Java并发编程示例,程序狗速度看过来!

Java程序设计语言

java 是一种可以撰写跨平台应用软件的面向对象的程序设计语言,是由Sun Microsystems公司于1995年5月推出的Java程序设计语言和Java平台(即JavaEE(j2ee), JavaME(j2me), JavaSE(j2se))的总称。


这篇文章主要介绍了Java多线程实现同时打印的相关资料,需要的朋友可以参考下

一道经典的面试题目:两个线程,分别打印AB,其中线程A打印A,线程B打印B,各打印10次,使之出现ABABABABA.. 的效果


 package com.shangshe.path;
 
 public class ThreadAB {
 
   /**
   * @param args
   */
   public static void main(String[] args) {
     
     final Print business = new Print();
     
     new Thread(new Runnable() {
       public void run() {
         for(int i=0;i<10;i++) {
           business.print_A();
         }
       }
     }).start();
     
     new Thread(new Runnable() {
       public void run() {
         for(int i=0;i<10;i++) {
           business.print_B();
         }
       }
     }).start();
     
   }
 }
 class Print {
   
   private boolean flag = true;
   
   public synchronized void print_A () {
     while(!flag) {
       try {
         this.wait();
       } catch (InterruptedException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
       }
     }
     System.out.print("A");
     flag = false;
     this.notify();
   }
   
   public synchronized void print_B () {
     while(flag) {
       try {
         this.wait();
       } catch (InterruptedException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
       }
     }
     System.out.print("B");
     flag = true;
     this.notify();
   }
 }

由上面的例子我们可以设计出3个线程乃至于n个线程的程序,下面给出的例子是3个线程,分别打印A,B,C 10次,使之出现ABCABC.. 的效果


public class ThreadABC {

  /**
   * @param args
   */
  public static void main(String[] args) {
    
    final Print business = new Print();
    
    new Thread(new Runnable() {
      public void run() {
        for(int i=0;i<100;i++) {
          business.print_A();
        }
      }
    }).start();
    
    new Thread(new Runnable() {
      public void run() {
        for(int i=0;i<100;i++) {
          business.print_B();
        }
      }
    }).start();
    
    new Thread(new Runnable() {
      public void run() {
        for(int i=0;i<100;i++) {
          business.print_C();
        }
      }
    }).start();
    
  }
}
class Print {
  
  private boolean should_a = true;
  private boolean should_b = false;
  private boolean should_c = false;
  
  public synchronized void print_A () {
    while(should_b || should_c) {
      try {
        this.wait();
      } catch (InterruptedException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
    }
    System.out.print("A");
    should_a = false;
    should_b = true;
    should_c = false;
    this.notifyAll();
  }
  
  public synchronized void print_B () {
    while(should_a || should_c) {
      try {
        this.wait();
      } catch (InterruptedException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
    }
    System.out.print("B");
    should_a = false;
    should_b = false;
    should_c = true;
    this.notifyAll();
  }
  
  public synchronized void print_C () {
    while(should_a || should_b) {
      try {
        this.wait();
      } catch (InterruptedException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
    }
    System.out.print("C");
    should_a = true;
    should_b = false;
    should_c = false;
    this.notifyAll();
  }
}

再一次证明了软件工程的重要性了;在多线程程序中,应该说在程序中,我们应该把那些业务逻辑代码放到同一个类中,使之高内聚,低耦合



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