ExecutorService

最新推荐文章于 2019-11-01 16:36:15 发布

原创最新推荐文章于 2019-11-01 16:36:15 发布 · 532 阅读

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本文通过一个具体示例展示了如何使用 Java 中的 ExecutorService 来管理线程池，包括创建固定大小的线程池、定义 Callable 任务、提交任务并获取结果。

package com.executorservice;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

public class ExecutorServiceTest {

private class QueryTask implements Callable<String> {
private int i;

  public QueryTask(int i) {
   super();
   this.i = i;

  }

  public String call() throws Exception {
   System.out.println(i);
   return "fsfs";
  }
}

public void run(){
  ExecutorService queryService = Executors.newFixedThreadPool(5);
  int i = 0;
  List<Callable<String>> l = new ArrayList<Callable<String>>();

  l.add((Callable<String>)new QueryTask(i++));
  l.add((Callable<String>)new QueryTask(i++));
  l.add((Callable<String>)new QueryTask(i++));
  l.add((Callable<String>)new QueryTask(i++));
  l.add((Callable<String>)new QueryTask(i++));


  try {
   List<Future<String>> futures = queryService.invokeAll(l);
   for(Future future : futures){
    System.out.println();
   }
  } catch (InterruptedException e) {
   e.printStackTrace();
  }
}

/**
* @param args
*/
public static void main(String[] args) {
  ExecutorServiceTest executorServiceTest = new ExecutorServiceTest();
  executorServiceTest.run();
}

}