Kajian 2 - ButtonGroup

JButton Group adalah membuat  multi-lingkup  pengecualian  untuk  satu  set

tombol. Menciptakan satu set tombol ButtonGroup dengan objek yang sama berarti

salah  satu  yang  dipilh,  dari  tombol-tombol  tersebut  akan  menonaktifkan  semua

tombol lain dalam grup.

Beikut Contoh Sintaknya :

import javax.swing.*;

import java.awt.event.*;

import java.awt.*;

public class buttong extends JFrame implements ActionListener {

      JRadioButton bgRed, bgBlue, bgBlack;

      ButtonGroup grup1;

      public buttong() {

                  setTitle("Demo Radio Button");

                  setDefaultCloseOperation(EXIT_ON_CLOSE);

                  getContentPane().setLayout(

                                          new BoxLayout(getContentPane(), BoxLayout.Y_AXIS));

                  bgRed = new JRadioButton("Red");

                  bgBlue = new JRadioButton("Blue", false);

                  bgBlack = new JRadioButton("Black", false);

                  bgRed.setActionCommand("merah");

                  bgBlue.setActionCommand("biru");

                  bgBlack.setActionCommand("hitam");

                  grup1 = new ButtonGroup();

                  grup1.add(bgRed);

                  grup1.add(bgBlue);

                  grup1.add(bgBlack);

                  getContentPane().add(bgRed);

                  getContentPane().add(bgBlue);

                  getContentPane().add(bgBlack);

                  bgRed.addActionListener(this);

                  bgBlue.addActionListener(this);

                  bgBlack.addActionListener(this);

      }

      public void actionPerformed(ActionEvent evt) {

                  if (bgRed.isSelected())

                              getContentPane().setBackground(Color.red);

                  else if (evt.getActionCommand().equals("biru"))

                              getContentPane().setBackground(Color.blue);

                  else

                              getContentPane().setBackground(Color.black);

      }

      public static void main(String[] args) {

                  buttong demoApp = new buttong();

                  demoApp.setSize(250, 225);

                  demoApp.setVisible(true);

      }

}