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.TimeUnit;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<Future> futureList = new ArrayList<Future>(); 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); futureList.add(future); } pool.shutdown(); for (Future f: futureList){ System.out.println(f.get()); } }}

结果：

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