執行器框架給我們提供了一個方法，讓我們可以傳送給執行器一個任務列表，並等待任務列表中的所有任務執行完畢。然後它將返回一個與任務列表對應的Future列表。

package com.primer.demo.util;

import lombok.extern.slf4j.Slf4j;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.*;

@Slf4j
public class ThreadPool {

    private static ExecutorService executorService = new
 
 ThreadPoolExecutor(100, 500, 1, TimeUnit.SECONDS, new LinkedBlockingDeque());

    public static <T> List<T> addTask(List<Callable<T>> tasks) {
        List<Future<T>> futureList = null;
        List<T> results = null;
        try {
            futureList = executorService.invokeAll(tasks);
            results = new
 
 ArrayList<>();
            for (Future<T> future : futureList) {
                results.add(future.get());
            }
        } catch (InterruptedException | ExecutionException e) {
            e.printStackTrace();
        }
        return results;
    }
}

建立多個任務並顯示結果：

package com
 
.primer.demo.service;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;

import org.junit.FixMethodOrder;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.MethodSorters;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.annotation.Rollback;
import org.springframework.test.context.junit4.SpringRunner;

import com.primer.demo.util.ThreadPool;

@RunWith(SpringRunner.class)
@SpringBootTest
@FixMethodOrder(MethodSorters.NAME_ASCENDING)
@Rollback(false)
public class Demo2ServiceTest {

    @Test
    public void test(){
        List<Callable<String>> callables = new ArrayList<>();
        for(int i=0;i<10;i++){
            callables.add(()-> Math.random()+"");
        }
        List<String> res = ThreadPool.addTask(callables);
        System.out.println("**********************");
        for(String str : res){
            System.out.println(str);
        }
    }
}