PROGRAMMING ACTIVITY: WORKING WITH BUTTONS In this activity, you will work with

Question

PROGRAMMING ACTIVITY: WORKING WITH BUTTONS

In this activity, you will work with RADIO buttons in java
Create a GUI application that performs a distance conversion. kilometers to miles, kilometers to feet and kilometers to inches. Please search and find out the conversion units.

The Application will contain at least 3 Radio buttons, 2 labels, 1 Text Field and 1 Separator. If you would like to add additional controls to practice GUI, you may do so, but make sure to fulfill the requirements first.

Your output must be formatted.

Explanation / Answer

Hope it may helps you......

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

/**
The MetricConverterWindow class lets the user enter a
distance in kilometers. Radio buttons can be selected to
convert the kilometers to miles, feet, or inches.
*/

public class MetricConverterWindow extends JFrame
{
private JPanel panel;                  // A holding panel
private JLabel messageLabel;           // A message to the user
private JTextField kiloTextField;      // To hold user input
private JRadioButton milesButton;      // To convert to miles
private JRadioButton feetButton;       // To convert to feet
private JRadioButton inchesButton;     // To convert to inches
private ButtonGroup radioButtonGroup; // To group radio buttons
private final int WINDOW_WIDTH = 400; // Window width
private final int WINDOW_HEIGHT = 100; // Window height

/**
Constructor
*/

public MetricConverterWindow()
{
// Set the title.
setTitle("Metric Converter");

// Set the size of the window.
setSize(WINDOW_WIDTH, WINDOW_HEIGHT);

// Specify an action for the close button.
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

// Build the panel and add it to the frame.
buildPanel();

// Add the panel to the frame's content pane.
add(panel);

// Display the window.
setVisible(true);
}

/**
The buildPanel method adds a label, text field, and
and three buttons to a panel.
*/

private void buildPanel()
{
// Create the label, text field, and radio buttons.
messageLabel = new JLabel("Enter a distance in kilometers");
kiloTextField = new JTextField(10);
milesButton = new JRadioButton("Convert to miles");
feetButton = new JRadioButton("Convert to feet");
inchesButton = new JRadioButton("Convert to inches");

// Group the radio buttons.
radioButtonGroup = new ButtonGroup();
radioButtonGroup.add(milesButton);
radioButtonGroup.add(feetButton);
radioButtonGroup.add(inchesButton);

// Add action listeners to the radio buttons.
milesButton.addActionListener(new RadioButtonListener());
feetButton.addActionListener(new RadioButtonListener());
inchesButton.addActionListener(new RadioButtonListener());

// Create a panel and add the components to it.
panel = new JPanel();
panel.add(messageLabel);
panel.add(kiloTextField);
panel.add(milesButton);
panel.add(feetButton);
panel.add(inchesButton);
}

/**
Private inner class that handles the event when
the user clicks one of the radio buttons.
*/

private class RadioButtonListener implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
     String input;          // To hold the user's input
     String convertTo = ""; // The units we're converting to
     double result = 0.0;   // To hold the conversion

     // Get the kilometers entered.
     input = kiloTextField.getText();

     // Determine which radio button was clicked.
     if (e.getSource() == milesButton)
     {
        // Convert to miles.
        convertTo = " miles.";
        result = Double.parseDouble(input) * 0.6214;
     }
     else if (e.getSource() == feetButton)
     {
        // Convert to feet.
        convertTo = " feet.";
        result = Double.parseDouble(input) * 3281.0;
     }
     else if (e.getSource() == inchesButton)
     {
        // Convert to inches.
        convertTo = " inches.";
        result = Double.parseDouble(input) * 39370.0;
     }

     // Display the conversion.
     JOptionPane.showMessageDialog(null, input +
              " kilometers is " + result + convertTo);
}
}

/**
The main method creates an instance of the
MetricConverterWindow class, displaying its window.
*/

public static void main(String[] args)
{
new MetricConverterWindow();
}
}

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