多线程-实现多线程的几种方案

来源：互联网发布：python 执行外部程序编辑：程序博客网时间：2024/06/07 18:22

三种实现多线程的方式：

无返回值：继承Thread类，或者实现Runnable接口（如果当前类已经继承了其他类）

有返回值：实现Callable接口

public class Test {    public static void main(String[] args) throws ExecutionException,            InterruptedException{        // thread class        ThreadTest1 threadTest1 = new ThreadTest1();        threadTest1.start();        // Runnable interface        ThreadRunnableTest threadRunnableTest = new ThreadRunnableTest();        Thread thread = new Thread(threadRunnableTest);        thread.start();        // Callable interface        System.out.println("----程序开始运行----");        Date date1 = new Date();        int taskSize = 8;        // 创建一个线程池        ExecutorService pool = Executors.newFixedThreadPool(taskSize);        // 创建多个有返回值的任务        List<Future> list = new ArrayList<>();        for (int i = 0; i < 10; i++) {            Callable<Object> c = new ThreadCallableTest(i + "");            Future f = pool.submit(c);            list.add(f);        }        // 关闭线程池        pool.shutdown();        // 获取所有并发任务的运行结果        for (Future f : list) {            // 从Future对象上获取任务的返回值，并输出到控制台            System.out.println(">>>" + f.get().toString());        }        Date date2 = new Date();        System.out.println("----程序结束运行----，程序运行时间【"                + (date2.getTime() - date1.getTime()) + "毫秒】");    }

public class ThreadCallableTest implements Callable<Object> {    private String taskNum;    public ThreadCallableTest(String taskNum) {        this.taskNum = taskNum;    }    @Override    public Object call() throws Exception {        System.out.println(">>>" + taskNum + "任务启动");        System.out.println(Thread.currentThread().getName());        Date dateTmp1 = new Date();        //Thread.sleep(100);        Date dateTmp2 = new Date();        long time = dateTmp2.getTime() - dateTmp1.getTime();        System.out.println(">>>" + taskNum + "任务终止");        return taskNum + "任务返回运行结果,当前任务时间【" + time + "毫秒】";    }}

public class ThreadRunnableTest implements Runnable{    @Override    public void run() {        System.out.println("测试runnable接口");    }}

public class ThreadTest1 extends Thread{    public void run(){        System.out.println("测试Thread");    }}

线程池，信号量。。。

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