GUI exercise

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package guiexercise2.buttonlistener;

import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;

/**
 *
 * @author hakase
 */

class butang extends JFrame implements ActionListener {
    JButton butangMerah, butangHijau;

    public butang(String tajuk) {
        super(tajuk);

        butangMerah = new JButton("MERAH");
        butangHijau = new JButton("HIJAU");

        butangMerah.setActionCommand("meRAh");
        butangHijau.setActionCommand("hiJAu");

        butangMerah.addActionListener(this);
        butangHijau.addActionListener(this);

        setLayout(new FlowLayout());
        add(butangMerah);
        add(butangHijau);
    }

    public void actionPerformed(ActionEvent UUUUE) {
        if (UUUUE.getActionCommand().equals("meRAh"))
            getContentPane().setBackground(Color.RED);
        else
            getContentPane().setBackground(Color.GREEN);
        repaint();
    }
}   //  end of butang class

class butangRadio extends JPanel implements ActionListener {
    private JRadioButton radioSatu, radioDua, radioTiga;
    private JLabel labelSatu, labelDua, labelTiga;

    public butangRadio() {
        super.setLayout(new FlowLayout());
        radioSatu = new JRadioButton("Label SATU");
        radioDua = new JRadioButton("Label DUA");
        radioTiga = new JRadioButton("Label TIGA");

        labelSatu = new JLabel("Tunjuk Label SATU");
        labelDua = new JLabel("Tunjuk Label DUA");
        labelTiga = new JLabel("Tunjuk Label TIGA");

        labelSatu.setVisible(false);
        labelDua.setVisible(false);
        labelTiga.setVisible(false);

        radioSatu.setActionCommand("rdio1");
        radioDua.setActionCommand("rdio2");
        radioTiga.setActionCommand("rdio3");

        radioSatu.addActionListener(this);
        radioDua.addActionListener(this);
        radioTiga.addActionListener(this);

        ButtonGroup butangDen = new ButtonGroup();
        butangDen.add(radioSatu);
        butangDen.add(radioDua);
        butangDen.add(radioTiga);

        add(radioSatu);
        add(radioDua);
        add(radioTiga);

        add(labelSatu);
        add(labelDua);
        add(labelTiga);
    }
    public void actionPerformed(ActionEvent eS) {
        if("rdio1".equals(eS.getActionCommand())) {
            labelSatu.setVisible(true);
            labelDua.setVisible(false);
            labelTiga.setVisible(false);
        }
        if("rdio2".equals(eS.getActionCommand())) {
            labelSatu.setVisible(false);
            labelDua.setVisible(true);
            labelTiga.setVisible(false);
        }
        if("rdio3".equals(eS.getActionCommand())) {
            labelSatu.setVisible(false);
            labelDua.setVisible(false);
            labelTiga.setVisible(true);
        }
    }
}   //  end of butangRadio class

public class GUIExercise2Buttonlistener {
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        /*

        butang uji = new butang("TEKAN.LA");
        uji.setSize(300, 150);
        uji.setVisible(true);
        uji.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        */

        JFrame kerangka = new JFrame("Guna butang radio");
        kerangka.setSize(180, 300); // pixel X, pixel Y
        kerangka.setVisible(true);
        kerangka.add(new butangRadio());
        kerangka.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}