java線程實現的四種方式

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　　java多線程的實現可以通過以下四種方式

　　　　1.繼承Thread類，重寫run方法

　　　　2.實現Runnable介面，重寫run方法

　　　　3.通過Callable和FutureTask建立線程

　　　　4.通過線程池建立線程

　　方式1,2不再贅述.

　　方式3,通過Callable和FutureTask建立線程實現多線程

    @Test    public void MyCallableTest() throws Exception {        //建立線程執行對象        MyCallable myCallable = new MyCallable();        FutureTask<String> futureTask = new FutureTask<>(myCallable);        //執行線程        Thread thread = new Thread(futureTask);        thread.start();        //擷取線程方法返回資料        System.out.println(futureTask.get());    }    /**     * 建立實作類別     */    class MyCallable implements Callable<String>{        @Override        public String call() throws Exception {            System.out.println("test thread by callable");            return "result";        }    }

　　方式4,通過線程池建立線程

public class ThreadPoolStu {    @Test    public void TestThreadPool1() throws InterruptedException, ExecutionException {        ExecutorService executorService = Executors.newFixedThreadPool(2);                //執行Runnable介面實作類別 方式1        MyRunnable runnable1 = new MyRunnable();        executorService.execute(runnable1);                //執行Runnable介面實作類別 方式2        MyRunnable runnable2 = new MyRunnable();        Future<?> future2 = executorService.submit(runnable2);        System.out.println(future2.get());//若未執行完會阻塞該線程                //執行Callable介面實作類別        MyCallable callable3 = new MyCallable();        Future<String> future3 = executorService.submit(callable3);        System.out.println(future3.get());//若未執行完會阻塞該線程                // 關閉線程池        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");    }}

 

java線程實現的四種方式