java界面设计2

import javax.swing.*;
public class JPaneDemo extends JPanel{
        public JPanel part1(){
           JPanel panel1=new JPanel();
           panel1.add(new JLabel("请输入要猜测的数字"));//JLabel：标签
           panel1.add(new JTextfield("输入的数字"));//JTextfield:文本框
           panel1.setBackground(Color.cyan);
           panel1.setVisible(true);
           return panel1;
     }
        public JPanel  part2(){
            JPanel panel2=new JPanel();
            panel2.add(new JButton("开始猜测"));
            panel2.add(new JButton("重新猜测"));
            panel2.add(new JButton("退出猜测"));
            panel2.setBackground(Color.green);
            panel2.setVisible(true);
            return panel2;
      }
         public JPaneDemo(){
             add(part1());
             add(part2());
             setVisible(true);
      }
         public static void main(String args[]){
              JFframe=frame=new JFrame();//窗体控件；
               frame.setTitle("猜字游戏");
               frame.setSize(300,300);                                                                                                                            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
               Container con=frame.getContentPane();
               JPaneDemo demo1=new JPaneDemo();
               demo1.setBackground(Color.green);
               con.add(demo1);
               frame.setVisible(true);
      }
}