程序代码：

import java.awt.*;

import javax.swing.*;
public class MyGUI extends Frame{
    JButton j1;
    JLabel l1,l2;
    JTextField t1,t2;
    MyGUI()
    {
        setLayout(new FlowLayout());
        JFrame b=new JFrame();
        
    

        setBounds(200, 300, 200, 400);
        setVisible(true);
    }