Rewrite the below programto add a group of radio buttons to select background co

Question

Rewrite the below programto add a group of radio buttons to select background colors. Theavailable colors are red, yellow, white, gray, andgreen.

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

public class ButtonDemo extends JFrame{
// Create a panel for displaying message
protected MessagePanel messagePanel
   = new MessagePanel ("Welcome toJava");

// Declare two buttons to movethe message left and right
private JButton jbtLeft = new JButton("<=");
private JButton jbtRight = newJButton("=>");

public static void main(String[]args) {
    ButtonDemo frame = new ButtonDemo();
    frame.setTitle("ButtonDemo");
    frame.setLocationRelativeTo(null); // Center theframe
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(500, 200);
    frame.setVisible(true);
} //main

public ButtonDemo() { //Constructor
    // Set the background color of messagePanel
   messagePanel.setBackground(Color.white);

    // Create PaneljpButtons to hold two Buttons "<=" and "right =>"
    JPanel jpButtons = new JPanel();
    jpButtons.setLayout(new FlowLayout());
    jpButtons.add(jbtLeft);
    jpButtons.add(jbtRight);

    // Set keyboardmnemonics
    jbtLeft.setMnemonic('L');    //press Alt+L to move left
    jbtRight.setMnemonic('R'); // press Alt+Lto move right

    // Set icons andremove text
   // jbtLeft.setIcon(newImageIcon("image/left.gif"));
   // jbtRight.setIcon(newImageIcon("image/right.gif"));
   // jbtLeft.setText(null);
   // jbtRight.setText(null);

    // Set tool tip texton the buttons
    jbtLeft.setToolTipText("Move message toleft");
    jbtRight.setToolTipText("Move message toright");

    // Place panels inthe frame
    setLayout(new BorderLayout());
    add(messagePanel, BorderLayout.CENTER);
    add(jpButtons,BorderLayout.SOUTH);

    // Register listenerswith the buttons
    jbtLeft.addActionListener (new ActionListener(){
      public voidactionPerformed(ActionEvent e) {
       messagePanel.moveLeft();
      }
    });

   jbtRight.addActionListener (new ActionListener() {
      public voidactionPerformed(ActionEvent e) {
       messagePanel.moveRight();
      }
    });
}
}

Explanation / Answer

import java.awt.*;import java.awt.event.*;import javax.swing.*;public class JRadioButtonDemo extends JPanel {static JFrame frame;RadioListener myListener = null;static JRadioButton red_radio,yellow_radio,white_radio,gray_radio,green_radio;public JRadioButtonDemo() {// Create the radio buttons and assign Keyboard shortcuts using// Mnemonicsred_radio = new JRadioButton("Red");red_radio.setMnemonic(KeyEvent.VK_N);red_radio.setActionCommand("Red");red_radio.setSelected(true);yellow_radio = new JRadioButton("Yellow");yellow_radio.setMnemonic(KeyEvent.VK_A);yellow_radio.setActionCommand("Yellow");white_radio = new JRadioButton("white");white_radio.setMnemonic(KeyEvent.VK_S);white_radio.setActionCommand("White");gray_radio = new JRadioButton("gray");gray_radio.setMnemonic(KeyEvent.VK_S);gray_radio.setActionCommand("Gray");green_radio = new JRadioButton("green");green_radio.setMnemonic(KeyEvent.VK_S);green_radio.setActionCommand("Green");// Group the radio buttons.ButtonGroup group = new ButtonGroup();group.add(red_radio);group.add(yellow_radio);group.add(white_radio);group.add(gray_radio);group.add(green_radio);// Register an action listener for the radio buttons.myListener = new RadioListener();red_radio.addActionListener(myListener);gray_radio.addActionListener(myListener);green_radio.addActionListener(myListener);yellow_radio.addActionListener(myListener);white_radio.addActionListener(myListener);// Set up the picture label// Set the Default Image// Put the radio buttons in a column in a panelJPanel jplRadio = new JPanel();jplRadio.setLayout(new GridLayout(0, 1));jplRadio.add(red_radio);jplRadio.add(yellow_radio);jplRadio.add(white_radio);jplRadio.add(gray_radio);jplRadio.add(green_radio);setLayout(new BorderLayout());add(jplRadio, BorderLayout.WEST);setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));}/** Listens to the radio buttons. */class RadioListener implements ActionListener {public void actionPerformed(ActionEvent e) {String s = e.getActionCommand();if(s== "Red")setBackground (Color.red);elseif(s=="Yellow")setBackground (Color.yellow);else if(s=="White")setBackground (Color.white);else if(s=="Gray")setBackground (Color.gray);else if(s=="Green")setBackground (Color.green);System.out.println(s);}}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);}}

Related Questions

Navigate

• Browse (All)
• Browse R
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.