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Java并发程序入门介绍

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今天看了看Java并发程序,写一写入门程序,并设置了线程的优先级.

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class Elem implements Runnable{
   public static int id = 0 ;
   private int cutDown = 5 ;
   private int priority;
  
   public void setPriority( int priority){
     this .priority = priority;
   }
  
   public int getPriority(){
     return this .priority;
   }
   public void run(){
     Thread.currentThread().setPriority(priority);
     int threadId = id++;
     while (cutDown-- > 0 ){
       double d = 1.2 ;
       while (d < 10000 )
         d = d + (Math.E + Math.PI)/d;
       System.out.println( "#" + threadId + "(" + cutDown + ")" );
     }
   }
}
public class Basic {
   public static void main(String args[]){
     for ( int i = 0 ; i < 10 ; i++){
       Elem e = new Elem();
       if (i == 0 )
         e.setPriority(Thread.MAX_PRIORITY);
       else
         e.setPriority(Thread.MIN_PRIORITY);
       Thread t = new Thread(e);
       t.start();
     }
   }
}

由于机器很强悍,所以先开始并没看到并发的效果,感觉是按顺序执行的,所以在中间加了浮点数的运算来延迟时间.

当然,main函数里面可以用Executors来管理线程.

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import java.util.concurrent.*;
class Elem implements Runnable{
   public static int id = 0 ;
   private int cutDown = 5 ;
   private int priority;
  
   public void setPriority( int priority){
     this .priority = priority;
   }
  
   public int getPriority(){
     return this .priority;
   }
   public void run(){
     Thread.currentThread().setPriority(priority);
     int threadId = id++;
     while (cutDown-- > 0 ){
       double d = 1.2 ;
       while (d < 10000 )
         d = d + (Math.E + Math.PI)/d;
       System.out.println( "#" + threadId + "(" + cutDown + ")" );
     }
   }
}
public class Basic {
   public static void main(String args[]){
//    for(int i = 0; i < 10; i++){
//      Elem e = new Elem();
//      if(i == 0 )
//        e.setPriority(Thread.MAX_PRIORITY);
//      else
//        e.setPriority(Thread.MIN_PRIORITY);
//      Thread t = new Thread(e);
//      t.start();
//    }
     ExecutorService exec = Executors.newCachedThreadPool();
     for ( int i = 0 ; i < 10 ; i++){
       Elem e = new Elem();
       if (i == 0 )
         e.setPriority(Thread.MAX_PRIORITY);
       else
         e.setPriority(Thread.MIN_PRIORITY);
       exec.execute(e);
     }
     exec.shutdown();
   }
}

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