java第一个窗口

import java.awt.*;import javax.swing.*;public class Moto extends JFrame {public void creatnew(String title){JFrame jf = new JFrame(title);Container con = jf.getContentPane();JLabel j = new JLabel("曹恒阳是个大帅哥");j.setHorizontalAlignment(SwingConstants.CENTER);con.add(j);con.setBackground(Color.gray);jf.setVisible(true);jf.setSize(300, 300);jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);}public static void main(String[] args) {// TODO Auto-generated method stubnew Moto().creatnew("New");}}