线程的基础知识

线程与进程的区别

并行与并发的区别

线程创建方式

继承Thread类

public class MyThread extends Thread {
    @Override
    public void run() {
        //TODO
    }
    
    public static void main(String[] args) {
        MyThread t1 = new MyThread();
        MyThread t2 = new MyThread();
        t1.start();
        t2.start();
    }
}

实现Runnable接口

public class MyRunnable implements Runnable {
    @Override
    public void run() {
        //TODO
    }
    
    public static void main(String[] args) {
        MyRunnable r = new MyRunnable();
        Thread t1 = new Thread(r);
        Thread t2 = new Thread(r);
        t1.start();
        t2.start();
    }
}

实现Callable接口

public class MyCallable implements Callable<String> {
    @Override
    public String call() throws Exception {
        //TODO
        return "ok";
    }
    
    public static void main(String[] args) {
        MyCallable mc = new MyCallable();
        FutureTask<String> ft = new FutureTask<String>(mc);
        Thread t1 = new Thread(ft);
        t1.start();
        String res = ft.get();
        System.out.println(res);
    }
}

线程池创建线程

public class MyExecutors implements Runnable {
    @Override
    public void run() {
        //TODO
    }
    
    public static void main(String[] args) {
        ExecutorService threadPool = Executors.newFixedThreadPool(3);
        threadPool.submit(new MyExecutors());
        threadPool.shutdown();
    }
}