package cn.itcast.demo6;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

/*

• 使用多執行緒技術,求和
• 兩個執行緒,1個執行緒計算1+100,另一個執行緒計算1+200的和
• 多執行緒的非同步計算
  */
  public class ThreadPoolDemo {
  public static void main(String[] args)throws Exception {
  ExecutorService es = Executors.newFixedThreadPool(2);
  Future f1 =es.submit(new GetSumCallable(100));
  Future f2 =es.submit(new GetSumCallable(200));
  System.out.println(f1.get());
  System.out.println(f2.get());
  es.shutdown();
  }
  }

package cn.itcast.demo6;

import java.util.concurrent.Callable;

public class GetSumCallable implements Callable{

//利用構造器來控制各個執行緒的傳參

private int a;
public GetSumCallable(int a){
	this.a=a;
}

public Integer call(){
	int sum = 0 ;
	for(int i = 1 ; i <=a ; i++){
		sum = sum + i ;
	}
	return sum;
}
 

}