Java多线程三种主要实现方式解析

Java多线程三种主要实现方式解析

多线程三种主要实现方式：继承Thread类，实现Runnable接口、Callable和Futrue。

一、简单实现

import java.util.concurrent.Callable;

import java.util.concurrent.ExecutionException;

import java.util.concurrent.FutureTask;

import java.util.concurrent.Thttp://imeUnit;

public class T02_HowToCreateThread {

//1.继承Thread类

static class MyThread extends Thread{

@Override

public void run() {

System.out.println("MyThread-->");

}

}

//3.实现Runnable接口

static class MyRun implements Runnable{

@Override

public void run() {

System.out.println("MyRunable-->");

}

}

//4.实现Callable接口

static class MyCall implements Callable{

@Override

public Object call() throws Exception {

System.out.println("myCallable-->");

return 1;

}

}

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

//1.继承Thread类

new MyThread().start();

//2.lambda与继承Thread类类//1.继承Thread类似，最简单

new Thread(()->{

System.out.println("lambda-->");

}).start();

//3.实现Runnable接口

new Thread(new MyRun()).start();

new Thread(new Runnable() {

@Override

public void run() {

System.out.println("simple->Runnable");

}

}).start();

//4.实现Callable接口,并用包装器FutureTask来同时实现Runable、Callable两个接口,可带返回结果

MyCall mycall = new MyCall();

FutureTask futureTask = new FutureTask(mycall);

new Thread(futureTask).start();

System.out.println(futureTask.get());

}

}

二、使用ExecutorService、Callable和Future一起实现带返回值

import java.util.ArrayList;

import java.util.List;

import java.util.concurrent.*;

/**

* 使用ExecutorsService、Callable、Future来实现多个带返回值的线程

*/

public class T02_HowToCreateThread02 {

static class MyCallable implements Callable{

private int taskNum;

public MyCallable(int taskNum){

this.taskNum = taskNum;

}

@Override

public Object call() throws Exception {

System.out.println("任务"+taskNum);

return "MyCallable.call()-->task"+taskNum;

}

}

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

int num = 5;

//创建一个线程池

ExecutorService pool = Executors.newFixedThreadPool(num);

List futureList = new ArrayList();

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

MyCallable mc = new MyCallable(i);

//执行任务，并返回值

Future future = pool.submit(mc);

futurhttp://eList.add(future);

}

pool.shutdown();

for (Future f: futureList){

System.out.println(f.get());

}

}

}

结果：

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