多線程三種主要實現方式：繼承Thread類，實現Runnable接口、Callable和Futrue。

一、簡單實現

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.繼承Thread類 static class MyThread extends Thread{ @Override public void run() { System.out.println('MyThread-->'); } } //3.實現Runnable接口 static class MyRun implements Runnable{ @Override public void run() { System.out.println('MyRunable-->'); } } //4.實現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.繼承Thread類 new MyThread().start(); //2.lambda與繼承Thread類類//1.繼承Thread類似，最簡單 new Thread(()->{ System.out.println('lambda-->'); }).start(); //3.實現Runnable接口 new Thread(new MyRun()).start(); new Thread(new Runnable() { @Override public void run() {System.out.println('simple->Runnable'); } }).start(); //4.實現Callable接口,并用包裝器FutureTask來同時實現Runable、Callable兩個接口,可帶返回結果 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一起實現帶返回值

import java.util.ArrayList;import java.util.List;import java.util.concurrent.*;/** * 使用ExecutorsService、Callable、Future來實現多個帶返回值的線程 */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('任務'+taskNum); return 'MyCallable.call()-->task'+taskNum; } } public static void main(String[] args) throws ExecutionException, InterruptedException { int num = 5; //創建一個線程池 ExecutorService pool = Executors.newFixedThreadPool(num); List<Future> futureList = new ArrayList<Future>(); for (int i = 0; i < num; i++){ MyCallable mc = new MyCallable(i); //執行任務，并返回值 Future future = pool.submit(mc); futureList.add(future); } pool.shutdown(); for (Future f: futureList){ System.out.println(f.get()); } }}

結果：

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