【并发编程的艺术读书笔记】创建线程的四种方式

news2024/12/23 8:19:01

创建线程的四种方式

继承Thread类

public class MyThread extends Thread {
 
    @Override
    public void run() {
        System.out.println("MyThread...run...");
    }
 
    
    public static void main(String[] args) {
 
        // 创建MyThread对象
        MyThread t1 = new MyThread() ;
        MyThread t2 = new MyThread() ;
 
        // 调用start方法启动线程
        t1.start();
        t2.start();
 
    }
    
}

实现Runnable接口

public class MyRunnable implements Runnable{
 
    @Override
    public void run() {
        System.out.println("MyRunnable...run...");
    }
 
    public static void main(String[] args) {
 
        // 创建MyRunnable对象
        MyRunnable mr = new MyRunnable() ;
 
        // 创建Thread对象
        Thread t1 = new Thread(mr) ;
        Thread t2 = new Thread(mr) ;
 
        // 调用start方法启动线程
        t1.start();
        t2.start();
 
    }
 
}

继承Thread和实现Runnable接口的区别

实现Runnable接口避免多继承局限
实现Runnable()可以更好的体现共享的概念

实现Callable接口

public class MyCallable implements Callable<String> {
 
    @Override
    public String call() throws Exception {
        System.out.println("MyCallable...call...");
        return "OK";
    }
 
    public static void main(String[] args) throws ExecutionException, InterruptedException {
 
        // 创建MyCallable对象
        MyCallable mc = new MyCallable() ;
 
        // 创建F
        FutureTask<String> ft = new FutureTask<String>(mc) ;
 
        // 创建Thread对象
        Thread t1 = new Thread(ft) ;
        Thread t2 = new Thread(ft) ;
 
        // 调用start方法启动线程
        t1.start();
 
        // 调用ft的get方法获取执行结果
        String result = ft.get();
 
        // 输出
        System.out.println(result);
 
    }
 
}

使用线程池

public class MyExecutors implements Runnable{
 
    @Override
    public void run() {
        System.out.println("MyRunnable...run...");
    }
 
    public static void main(String[] args) {
 
        // 创建线程池对象
        ExecutorService threadPool = Executors.newFixedThreadPool(3);
        threadPool.submit(new MyExecutors()) ;
 
        // 关闭线程池
        threadPool.shutdown();
 
    }
 
}