Question

Create a swing application to get following gui screen. All gui elements in the JFrame are JButton. You are expected to write proper event handler so that: • When the JButton with text "O" is pressed value of the button increased by 1. • When the JButton with text "a" is pressed the text will be replaced with the next ascii character. i.e it will be 'b' on first press, than 'c'on next press, so on. 0 а b с d 5 6

with java programming language

Answer 1

//Java Code

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.lang.reflect.InvocationTargetException;

public class SwingApplication extends JFrame {
//Create JButtons for GUI
JButton[] buttons = new JButton[12];
//Values for buttons to be updated
//and initialize it with values
private static int[] values = new int[]{0,1,2,3,4,5,6,7};
//ascii values for buttons to be updated
private static char[] asciiValue = new char[]{'a','b','c','d'};
//Constructor
public SwingApplication()
{

//set Frame
setLayout(new GridLayout(0,3,10,10));
setTitle("");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(600,400);
//JPanel
JPanel panel = new JPanel(new FlowLayout());
//Initialize JButtons for numbers
buttons[0] = new JButton("0");
buttons[1] = new JButton("1");
buttons[2] = new JButton("2");
buttons[3] = new JButton("3");
buttons[4] = new JButton("4");
buttons[5] = new JButton("5");
buttons[6] = new JButton("6");
buttons[7] = new JButton("7");

//Initialize JButtons for characters
buttons[8] = new JButton("a");
buttons[9] = new JButton("b");
buttons[10] = new JButton("c");
buttons[11] = new JButton("d");
//add JButtons to JPanels
panel.add(buttons[8]);
panel.add(buttons[9]);
panel.add(buttons[10]);
panel.add(buttons[11]);

//Add to JFrame
getContentPane().add(buttons[0]);
getContentPane().add(buttons[1]);
getContentPane().add(buttons[2]);
getContentPane().add(buttons[3]);
//Add panel to frame
getContentPane().add(panel);
getContentPane().add(buttons[4]);
getContentPane().add(buttons[5]);
getContentPane().add(buttons[6]);
getContentPane().add(buttons[7]);

//Set frame to visible
setVisible(true);
//register listener
buttons[0].addActionListener(new actionHandler());
buttons[1].addActionListener(new actionHandler());
buttons[2].addActionListener(new actionHandler());
buttons[3].addActionListener(new actionHandler());
buttons[4].addActionListener(new actionHandler());
buttons[5].addActionListener(new actionHandler());
buttons[6].addActionListener(new actionHandler());
buttons[7].addActionListener(new actionHandler());
buttons[8].addActionListener(new actionHandler());
buttons[9].addActionListener(new actionHandler());
buttons[10].addActionListener(new actionHandler());
buttons[11].addActionListener(new actionHandler());

}
//Action Listener handler buttons
private class actionHandler implements ActionListener
{

@Override
public void actionPerformed(ActionEvent e) {
//For JButton 0
if(e.getSource().equals(buttons[0]))
{
values[0]+=1;
buttons[0].setText(Integer.toString(values[0]));
}
//For JButton 1
if(e.getSource().equals(buttons[1]))
{
values[1]+=1;
buttons[1].setText(Integer.toString(values[1]));
}
//For JButton 2
if(e.getSource().equals(buttons[2]))
{
values[2]+=1;
buttons[2].setText(Integer.toString(values[2]));
}
//For JButton 3
if(e.getSource().equals(buttons[3]))
{
values[3]+=1;
buttons[3].setText(Integer.toString(values[3]));
}
//For JButton 4
if(e.getSource().equals(buttons[4]))
{
values[4]+=1;
buttons[4].setText(Integer.toString(values[4]));
}
//For JButton 5
if(e.getSource().equals(buttons[5]))
{
values[5]+=1;
buttons[5].setText(Integer.toString(values[5]));
}
//For JButton 6
if(e.getSource().equals(buttons[6]))
{
values[6]+=1;
buttons[6].setText(Integer.toString(values[6]));
}
//For JButton 7
if(e.getSource().equals(buttons[7]))
{
values[7]+=1;
buttons[7].setText(Integer.toString(values[7]));
}
//For JButton a
if(e.getSource().equals(buttons[8]))
{
asciiValue[0]+=1;
buttons[8].setText(Character.toString(asciiValue[0]));
}
//For JButton b
if(e.getSource().equals(buttons[9]))
{
asciiValue[1]+=1;
buttons[9].setText(Character.toString(asciiValue[1]));
}
//For JButton c
if(e.getSource().equals(buttons[10]))
{
asciiValue[2]+=1;
buttons[10].setText(Character.toString(asciiValue[2]));
}
//For JButton d
if(e.getSource().equals(buttons[11]))
{
asciiValue[3]+=1;
buttons[11].setText(Character.toString(asciiValue[3]));
}

}
}
public static void main(String[] args) throws InvocationTargetException, InterruptedException {
SwingUtilities.invokeAndWait(new Runnable() {
@Override
public void run() {
new SwingApplication();
}
});
}
}

//Output

- x 2 3 с d 4 5 6 7 8

//If you need any help regarding this solution.... please leave a comment........ thanks