java多线程有哪些实现方式?

java多线程有哪些实现方式?

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提示：以下是本篇文章正文内容，下面案例可供参考

一、继承Thread类，重写run方法，调用start方法

public class TreadTest extends Thread {@Overridepublic void run() {try {Thread.sleep(3000);} catch (InterruptedException e) {throw new RuntimeException(e);}System.out.println(Thread.currentThread().getName());}public static void main(String[] args) {TreadTest t = new TreadTest();t.start();System.out.println(Thread.currentThread().getName());}}

tips:start方法才是新开启线程，此时代码会先答应出来main，然后才是run方法中的线程名。
如果执行的是run方法：

public class TreadTest extends Thread {@Overridepublic void run() {try {Thread.sleep(3000);} catch (InterruptedException e) {throw new RuntimeException(e);}System.out.println(Thread.currentThread().getName());}public static void main(String[] args) {TreadTest t = new TreadTest();t.run();System.out.println(Thread.currentThread().getName());}}

只会打印main，因为run方法并没有开启一个新的线程，run方法只是保存线程运行的代码块，不会创建新的线程，只是一个普通方法

二、实现runnable接口，新建Thread类，用Thread构造函数初始化，调用start方法

public class TreadTest implements Runnable {@Overridepublic void run() {try {Thread.sleep(2000);} catch (InterruptedException e) {throw new RuntimeException(e);}System.out.println(Thread.currentThread().getName());}public static void main(String[] args) {Thread thread = new Thread(new TreadTest());thread.start();System.out.println(Thread.currentThread().getName());}
}

三、实现Callable接口，该方法可以通过FutureTask.get方法获取线程的结果

public class TreadTest implements Callable<String> {@Overridepublic String call() throws Exception {return Thread.currentThread().getName();}public static void main(String[] args) throws ExecutionException, InterruptedException {FutureTask<String> futureTask = new FutureTask<>(new TreadTest());new Thread(futureTask).start();System.out.println(futureTask.get());System.out.println(Thread.currentThread().getName());}
}