Java中实现多线程

继承 Thread 类

public class MyThread extends Thread {

    @Override
    public void run() {
        System.out.println("i am thread");
    }

    public static void main(String[] args) {
        new MyThread().start();
    }
}

实现 Runnable 接口

public class MyThread implements Runnable {

    @Override
    public void run() {
        System.out.println("i am thread");
    }

    public static void main(String[] args) {
        Thread thread = new Thread(new MyThread());
        thread.start();
    }

}

Thread 类实现了 Runnable 接口

package java.lang;

public class Thread implements Runnable {
    ……
}

实现 Runnable 接口的方式更好