带有返回值的多线程

通过ExecuteService,Callable,Future实现带有返回值的多线程：

1、通过实现Callable接口创建线程类

package com.example.demo.morethread;

import java.util.concurrent.*;

/**
 *使用带有返回值的线程
 */
public class CallableDemo implements Callable<String> {
    private String str;
    public CallableDemo(String str){
        this.str=str;
    }
    @Override
    public String call() throws Exception {
        if("线程1".equals(str)){
            Thread.sleep(1000);
        }
        System.out.println("线程："+str);
        return str;
    }
}

2、测试：

package com.example.demo.morethread;

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

public class Test {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        ExecutorService executorService= Executors.newFixedThreadPool(10);
        CallableDemo callableDemo=new CallableDemo("线程1");
        CallableDemo callableDemo1=new CallableDemo("线程2");
        Future<String> future=executorService.submit(callableDemo);
        Future<String> future1=executorService.submit(callableDemo1);
        System.out.println(future.get());//阻塞,线程1的值返回之后才会继续向下执行
        System.out.println(future1.get());//阻塞
        executorService.shutdown();
    }
}

运行结果如下：