说说线程有几种创建方式？

Java中创建线程主要有三种方式：

• 定义Thread类的子类，并重写该类的run方法

/**
 * 继承Thread-重写run方法
 * Created by BaiLi
 */
public class BaiLiThread {
    public static void main(string[] args) {
        MyThread myThread = new MyThread();
        myThread.run();
    }
}
class MyThread extends Thread {
    @Override
    public void run() {
        System.out.println("一键三连");
    }
}

• 定义Runnable接口的实现类，并重写该接口的run()方法

/**
 * 实现Runnable-重写run()方法
 * Created by BaiLi
 */
public class BaiLiRunnable {
    public static void main(String[] args) {
        MyRunnable myRunnable = new MyRunnable();
        new Thread(myRunnable).start();
    }
}
class MyRunnable implements Runnable {

    @Override
    public void run() {
        System.out.println("一键三连");
    }
}

• 定义Callable接口的实现类，并重写该接口的call()方法，一般配合FutureTask使用

/**
 * 实现Callable-重写call()方法
 * Created by BaiLi
 */
public class BaiLiCallable {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        FutureTask<String> ft = new FutureTask<String>(new MyCallable());
        Thread thread = new Thread(ft);
        thread.start();
        System.out.println(ft.get());
    }
}
class MyCallable implements Callable<String> {

    @Override
    public String call() throws Exception {
        return "一键三连";
    }
}