Home > Java Swing > JRadioButton trong Java Swing

JRadioButton trong Java Swing

Đặc điểm cơ bản của JRadioButton :

– Chỉ cho phép chọn 1  từ 1 nhóm các lựa chọn

Code minh họa sử dụng JRadioButton:

Ví dụ sau minh họa việc hiển thị hình ảnh tương ứng với lựa chọn từ RadioButton ( Lưu ý : Bạn cần có các ảnh hanoi.jpg,hue.jpg,saigon.jpg đặt trong thư mục code )

package quyetdv.javaswing.demo;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class JRadioButtonDemo extends JPanel {

    static JFrame frame;
    JLabel jlbPicture;
    RadioListener myListener = null;

    public JRadioButtonDemo() {
        // Create the radio buttons and assign Keyboard shortcuts using
        // Mnemonics
        JRadioButton jrbNumbers = new JRadioButton("HaNoi");
        jrbNumbers.setMnemonic(KeyEvent.VK_N);
        jrbNumbers.setActionCommand("HaNoi");
        jrbNumbers.setSelected(true);
        JRadioButton jrbAlphabets = new JRadioButton("Hue");
        jrbAlphabets.setMnemonic(KeyEvent.VK_H);
        jrbAlphabets.setActionCommand("Hue");
        JRadioButton jrbSymbols = new JRadioButton("SaiGon");
        jrbSymbols.setMnemonic(KeyEvent.VK_S);
        jrbSymbols.setActionCommand("SaiGon");
        // Group the radio buttons.
        ButtonGroup group = new ButtonGroup();
        group.add(jrbNumbers);
        group.add(jrbAlphabets);
        group.add(jrbSymbols);
        // Register an action listener for the radio buttons.
        myListener = new RadioListener();
        jrbNumbers.addActionListener(myListener);
        jrbAlphabets.addActionListener(myListener);
        jrbSymbols.addActionListener(myListener);
        // Set up the picture label
        jlbPicture = new JLabel(new ImageIcon("" + "hanoi" + ".jpg"));
        // Set the Default Image
        jlbPicture.setPreferredSize(new Dimension(177, 122));
        // Put the radio buttons in a column in a panel
        JPanel jplRadio = new JPanel();
        jplRadio.setLayout(new GridLayout(0, 1));
        jplRadio.add(jrbNumbers);
        jplRadio.add(jrbAlphabets);
        jplRadio.add(jrbSymbols);
        setLayout(new BorderLayout());
        add(jplRadio, BorderLayout.WEST);
        add(jlbPicture, BorderLayout.CENTER);
        setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
    }

    /** Listens to the radio buttons. */
    class RadioListener implements ActionListener {

        public void actionPerformed(ActionEvent e) {
            jlbPicture
                    .setIcon(new ImageIcon("" + e.getActionCommand() + ".jpg"));
        }
    }

    public static void main(String s[]) {
        frame = new JFrame("JRadioButton Usage Demo");
        frame.addWindowListener(new WindowAdapter() {

            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
        frame.getContentPane().add(new JRadioButtonDemo(), BorderLayout.CENTER);
        frame.pack();
        frame.setVisible(true);
    }
}

Kết quả :

JRadioButtonDemo_HaNoi

Link download source : https://www.dropbox.com/s/uvlack8alvsxhht/DemoJavaSwing_JRadioButton.7z

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Categories: Java Swing
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