java线程实现的四种方式

　　java多线程的实现可以通过以下四种方式

　　　　1.继承Thread类，重写run方法

　　　　2.实现Runnable接口，重写run方法

　　　　3.通过Callable和FutureTask创建线程

　　　　4.通过线程池创建线程

　　方式1,2不再赘述.

　　方式3,通过Callable和FutureTask创建线程实现多线程

    @Test
    public void MyCallableTest() throws Exception {
        //创建线程执行对象
        MyCallable myCallable = new MyCallable();
        FutureTask<String> futureTask = new FutureTask<>(myCallable);
        //执行线程
        Thread thread = new Thread(futureTask);
        thread.start();
        //获取线程方法返回数据
 System.out.println(futureTask.get()); } /** * 创建实现类 */ class MyCallable implements Callable<String>{ @Override public String call() throws Exception { System.out.println("test thread by callable"); return "result"; } }

　　方式4,通过线程池创建线程

public class ThreadPoolStu {

    @Test
    public void TestThreadPool1() throws InterruptedException, ExecutionException {
        ExecutorService executorService = Executors.newFixedThreadPool(2);
        
        //执行Runnable接口实现类 方式1
        MyRunnable runnable1 = new MyRunnable();
        executorService.execute(runnable1);
        
        //执行Runnable接口实现类 方式2
        MyRunnable runnable2 = new MyRunnable();
        Future<?> future2 = executorService.submit(runnable2); System.out.println(future2.get());//若未执行完会阻塞该线程 //执行Callable接口实现类 MyCallable callable3 = new MyCallable(); Future<String> future3 = executorService.submit(callable3); System.out.println(future3.get());//若未执行完会阻塞该线程 // 关闭线程池  executorService.shutdown(); } } class MyCallable implements Callable<String>{ @Override public String call() throws Exception { System.out.println("test thread by callable"); return "result"; } } class MyRunnable implements Runnable { @Override public void run() { System.out.println("thread execute"); } }