java多线程有几种实现方法

package com.kingh.thread.create;

/**

 * 创建线程with lambda

 *

 * @author <a href="https://blog.csdn.net/king_kgh>Kingh</a>

 * @version 1.0

 * @date 2019/3/18 10:04

 */

public class CreateThreadDemo5_Lambda {

    public static void main(String[] args) throws Exception {

        // 使用lambda的形式实例化线程任务类

        Runnable task = () -> {

            while (true) {

                // 输出线程的名字

                printThreadInfo();

            }

        };

        // 创建线程对象,并将线程任务类作为构造方法参数传入

        new Thread(task).start();

        // 主线程的任务，为了演示多个线程一起执行

        while (true) {

            printThreadInfo();

            Thread.sleep(1000);

        }

    }

    /**

     * 输出当前线程的信息

     */

    private static void printThreadInfo() {

        System.out.println("当前运行的线程名为： " + Thread.currentThread().getName());

        try {

            Thread.sleep(1000);

        } catch (Exception e) {

            throw new RuntimeException(e);

        }

    }

}

import java.util.concurrent.*;

import java.util.Date;

import java.util.List;

import java.util.ArrayList;

/**

* 有返回值的线程

*/

@SuppressWarnings("unchecked")

public class Test {

public static void main(String[] args) throws ExecutionException,

    InterruptedException {

   System.out.println("----程序开始运行----");

   Date date1 = new Date();

   int taskSize = 5;

   // 创建一个线程池

   ExecutorService pool = Executors.newFixedThreadPool(taskSize);

   // 创建多个有返回值的任务

   List<Future> list = new ArrayList<Future>();

   for (int i = 0; i < taskSize; i++) {

    Callable c = new MyCallable(i + " ");

    // 执行任务并获取Future对象

    Future f = pool.submit(c);

    // System.out.println(">>>" + f.get().toString());

    list.add(f);

   }

   // 关闭线程池

   pool.shutdown();

   // 获取所有并发任务的运行结果

   for (Future f : list) {

    // 从Future对象上获取任务的返回值，并输出到控制台

    System.out.println(">>>" + f.get().toString());

   }

   Date date2 = new Date();

   System.out.println("----程序结束运行----，程序运行时间【"

     + (date2.getTime() - date1.getTime()) + "毫秒】");

}

}

class MyCallable implements Callable<Object> {

private String taskNum;

MyCallable(String taskNum) {

   this.taskNum = taskNum;

}

public Object call() throws Exception {

   System.out.println(">>>" + taskNum + "任务启动");

   Date dateTmp1 = new Date();

   Thread.sleep(1000);

   Date dateTmp2 = new Date();

   long time = dateTmp2.getTime() - dateTmp1.getTime();

   System.out.println(">>>" + taskNum + "任务终止");

   return taskNum + "任务返回运行结果,当前任务时间【" + time + "毫秒】";

}

}