belajar program java

import java.awt.*;
import javax.swing.*;
class kuis2 extends Frame {
public static void main ( String [] args ) {
        Frame fr =new Frame("Tes Visual 2");
        Panel panel1 = new Panel();
        Panel panel2 = new Panel();
        Panel panel3 = new Panel();
        Panel panel4 = new Panel();
    panel1.setLayout(new FlowLayout(FlowLayout.CENTER));
    Label lb=new Label("Contoh Penggunaan Label");
    panel1.add(lb);
   
    panel2.setLayout(new FlowLayout(FlowLayout.LEFT));
    TextField tf1 = new TextField ("Text 1");
    TextField tf2 = new TextField ("Text 2");

    panel2.add(tf1);
    panel2.add(tf2);

    panel3.setLayout(new GridLayout(3,1));
    JRadioButton cb1= new JRadioButton("Check 1");
    JRadioButton cb2= new JRadioButton("Check 2");
    JRadioButton cb3= new JRadioButton("Check 3");
   
    panel3.add(cb1);
    panel3.add(cb2);
    panel3.add(cb3);

    panel4.setLayout(new FlowLayout());
    Button bt1= new Button("I Accept");
    Button bt2=new Button("I don't Accept");
    Button bt3 = new Button("Help");
    panel4.add(bt1);
    panel4.add(bt2);
    panel4.add(bt3);

    fr.add(panel1,BorderLayout.NORTH);
    fr.add(panel2, BorderLayout.WEST);
    fr.add(panel3,BorderLayout.EAST);
    fr.add(panel4, BorderLayout.SOUTH);

    fr.setSize(300,400);
    fr.setVisible(true);

    } }