Modify the following \'MessageBoxes\' application so it uses a single action lis
ID: 3540568 • Letter: M
Question
Modify the following 'MessageBoxes' application so it
uses a single action listener for each button. This will
require you to separate the single action listener logic
into multiple listeners, one for each button. Then modify
the code to provide additional options to two or more buttons.
/*
* The source code for this assignment started with
* a sample from "Thinking in Java" 3rd ed. page 825
* by Bruce Eckel. I have finished adding the rest
of the action logic.
*
* Try to implement one new action listener at a time
* do not try to do all of them and then compile
*/
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class MessageBoxes{
private JButton[] b = {
new JButton("Alert"),
new JButton("Yes/No"),
new JButton("Color"),
new JButton("Input"),
new JButton("3 Vals"),
};
private JTextField txt = new JTextField(15);
private JFrame frame;
private ActionListener al = new ActionListener(){
public void actionPerformed(ActionEvent e){
String id = ((JButton)e.getSource()).getText();
if(id.equals("Alert")){
JOptionPane.showMessageDialog(null,
"There's a bug on you!", "Hey!",
JOptionPane.ERROR_MESSAGE);
}
else if(id.equals("Yes/No")){
int val = JOptionPane.showConfirmDialog(null,
"or no", "Chose yes",
JOptionPane.YES_NO_OPTION);
if(val != JOptionPane.CLOSED_OPTION){
if(val == 0){
txt.setText("Yes");
}
else{
txt.setText("No");
}
}
}
else if(id.equals("Color")){
Object[] options = {"Red", "Green"};
int sel = JOptionPane.showOptionDialog(null,
"Choose a Color!", "Warning",
JOptionPane.DEFAULT_OPTION,
JOptionPane.WARNING_MESSAGE, null,
options, options[0]);
if(sel != JOptionPane.CLOSED_OPTION){
txt.setText("Color Selected: " + options[sel]);
}
}
else if(id.equals("Input")){
String val = JOptionPane.showInputDialog("How mant fingers do you see?");
txt.setText(val);
}
else if(id.equals("3 Vals")){
Object[] selections = {"First", "Second", "Third"};
Object val = JOptionPane.showInputDialog(null,
"Choose one", "Input",
JOptionPane.INFORMATION_MESSAGE,
null, selections, selections[0]);
if(val != null){
txt.setText(val.toString());
}
}
}
};
public MessageBoxes(){
frame = new JFrame("Title");
frame.setSize(250, 250);
frame.getContentPane().setLayout(new FlowLayout());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
for(int i = 0; i < b.length; i++){
frame.getContentPane().add(b[i]);
}
frame.getContentPane().add(txt);
frame.setVisible(true);
}
public void launchJFrame(){
for(int i = 0; i < b.length; i++){
b[i].addActionListener(al);
}
}
public static void main(String [] args){
MessageBoxes messageBoxes = new MessageBoxes();
messageBoxes.launchJFrame();
}
}
Explanation / Answer
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class MessageBoxes {
private JButton[] b = {
new JButton("Alert"),
new JButton("Yes/No"),
new JButton("Color"),
new JButton("Input"),
new JButton("3 Vals"),
};
private JTextField txt = new JTextField(15);
private JFrame frame;
public MessageBoxes() {
frame = new JFrame("Title");
frame.setSize(250, 250);
frame.getContentPane().setLayout(new FlowLayout());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
for (int i = 0; i < b.length; i++) {
frame.getContentPane().add(b[i]);
}
frame.getContentPane().add(txt);
frame.setVisible(true);
}
public void launchJFrame() {
//Action Listener1
b[0].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
JOptionPane.showMessageDialog(null,
"There's a bug on you!", "Hey!",
JOptionPane.ERROR_MESSAGE);
}
});
//Action Listener2
b[1].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
int val = JOptionPane.showConfirmDialog(null,
"or no", "Chose yes",
JOptionPane.YES_NO_OPTION);
if (val != JOptionPane.CLOSED_OPTION) {
if (val == 0) {
txt.setText("Yes");
}
else {
txt.setText("No");
}
}
}
});
//Action Listener3
b[2].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
Object[] options = { "Red", "Green" };
int sel = JOptionPane.showOptionDialog(null,
"Choose a Color!", "Warning",
JOptionPane.DEFAULT_OPTION,
JOptionPane.WARNING_MESSAGE, null,
options, options[0]);
if (sel != JOptionPane.CLOSED_OPTION) {
txt.setText("Color Selected: " + options[sel]);
}
}
});
//Action Listener4
b[3].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
String val = JOptionPane
.showInputDialog("How mant fingers do you see?");
txt.setText(val);
}
});
//Action Listener5
b[4].addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
Object[] selections = { "First", "Second", "Third" };
Object val = JOptionPane.showInputDialog(null,
"Choose one", "Input",
JOptionPane.INFORMATION_MESSAGE,
null, selections, selections[0]);
if (val != null) {
txt.setText(val.toString());
}
}
});
}
public static void main(String[] args) {
MessageBoxes messageBoxes = new MessageBoxes();
messageBoxes.launchJFrame();
}
}
Sample output:
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