Java应用Thread类定义两个线程对象要求每个线程输出它的名字每隔300毫秒输出一次共输出20次。

下面是Java代码实现：

public class MyThread extends Thread {
    private String name;

    public MyThread(String name) {
        this.name = name;
    }

    @Override
    public void run() {
        for (int i = 0; i < 20; i++) {
            System.out.println(name);
            try {
                Thread.sleep(300);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    public static void main(String[] args) {
        MyThread thread1 = new MyThread("Thread1");
        MyThread thread2 = new MyThread("Thread2");

        thread1.start();
        thread2.start();
    }
}
``