Java執行器入門

package com.ex;

import java.util.concurrent.Executors;
import java.util.concurrent.ThreadPoolExecutor;

public class Server {

private   ThreadPoolExecutor  executor;



public  ThreadPoolExecutor getExecutor(){
    return  this.executor;
}


public  Server(){

// executor=(ThreadPoolExecutor) Executors.newCachedThreadPool();// cache線程池在真正有任務的時候才初始化，隨着任務變化而變化

executor=(ThreadPoolExecutor) Executors.newFixedThreadPool(10);//固定任務的線程池
    System.out.println("總共線程池------------------------"+executor.getPoolSize());
    System.out.println("活動的線程池數量---------------------"+executor.getActiveCount());
}

public  void  excuteTask(Task  task){
        
      executor.execute(task);
      System.out.println("一共得線程池"+executor.getPoolSize());
        System.out.println("活動的線程池數量，即正在處理任務的線程數量"+executor.getActiveCount());
}

public static void main(String[] args) {
    Server  server=new Server();
    for(int i=0;i<100;i++){
        
        Task  task=new Task("線程id"+i);
        
        server.excuteTask(task);
    }
    /**

• 主線程不斷詢問線程組是否執行完畢
  */

  while(true){

  if(server.getExecutor().getCompletedTaskCount()==100){

  System.out.println("總共線程池------------------------"+server.getExecutor().getPoolSize());
     System.out.println("活動的線程池數量---------------------"+server.getExecutor().getActiveCount());
     server.getExecutor().shutdown();
     break;

  }

  }
      
  }

}

package com.ex;

import java.util.Date;

public class Task implements Runnable{

private  String  name;
private  Date  date;

public  Task(String name){
    
    this.date=new Date();
    
    this.name=name;
    
    
    
    
}


@Override
public void run() {

    
    
    try {
        System.out.println(this.name+"----開始執行任務");
        Thread.sleep((long) (Math.random()*1000));
        System.out.println(this.name+"----結束執行任務");
    } catch (InterruptedException e) {
        
        e.printStackTrace();
    }
    
}

}