Question

Code in Java

Change the instructionLabel to ask the user to enter a numeric value into the textField and click the button to convert the entered value from kilometers to miles (1.609344 km = 1 mile).

When the actionButton on the form is clicked, ActionWindow should take the value entered in the textField, convert it from kilometers to miles, and display the result in the resultField.

import java.awt.Container;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class ActionWindow extends JFrame {

   JLabel label;
   JButton button;
   JFrame frame;
   JTextField text;

   public ActionWindow() {
       label = new JLabel();
       button = new JButton();
       frame = new JFrame();
       text = new JTextField();
   }

   public static void main(String[] args) {
       WindowRunnable myWindow = new WindowRunnable();
       javax.swing.SwingUtilities.invokeLater(myWindow);
   }

   public static void createAndShowGUI() {
       ActionWindow frame = new ActionWindow();
       frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE);
       frame.addComponentsToPane(frame.getContentPane());
       frame.pack();
       frame.setVisible(true);
   }

   public void addComponentsToPane(Container pane) {
       JPanel panel = new JPanel();
       panel.add(label);

       pane.add(panel);
      
       JLabel instructionLabel = new JLabel("");
       panel.add(instructionLabel);
      
       JTextField textField = new JTextField("");
       panel.add(textField);
      
       JButton actionButton = new JButton("");
       panel.add(actionButton);
      
       JLabel resultField = new JLabel("");
       panel.add(resultField);

   }
}

class WindowRunnable implements Runnable {
   public void run() {
       ActionWindow.createAndShowGUI();
   }
}

Answer 1

//Create class ActionWindow.java

import java.awt.Container;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class ActionWindow extends JFrame {

JLabel label;
JButton button;
JFrame frame;
JTextField text;

public ActionWindow() {
label = new JLabel();
button = new JButton();
frame = new JFrame();
text = new JTextField();
}

public static void main(String[] args) {
WindowRunnable myWindow = new WindowRunnable();
javax.swing.SwingUtilities.invokeLater(myWindow);
}

public static void createAndShowGUI() {
ActionWindow frame = new ActionWindow();
frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE);
frame.addComponentsToPane(frame.getContentPane());
frame.pack();
frame.setVisible(true);
}

public void addComponentsToPane(Container pane) {
JPanel panel = new JPanel();
  
panel.add(label);

pane.add(panel);
//change the label of instructionLabel
JLabel instructionLabel = new JLabel("Enter Kilometers to convert to miles(Integer)");
panel.add(instructionLabel);
//set size to textField to get input
JTextField textField = new JTextField(12);

panel.add(textField);//add textfield to panel

JButton actionButton = new JButton("Convert to Miles");
panel.add(actionButton);//add button to panel

JLabel resultField = new JLabel("");//resultLabel to displayy result
panel.add(resultField);//add result label to panel
  
actionButton.addActionListener(new ActionListener() {
//add action listener to button to calculate entered kilometers in miles
@Override
public void actionPerformed(ActionEvent arg0) {
//after clicking button should print on window
if(textField.getText().toString().equals(""))
{
JOptionPane.showMessageDialog(panel, "Please enter kiltometers to converts in miles");
}else
{
try
{
double kilometers=Double.parseDouble(textField.getText().toString());//get kilometers from user
double miles = kilometers * 0.621;//1.609344 km=1 mile, hence
resultField.setText(kilometers+" (km) = "+miles+" miles ");//display result to resulField
}
catch(NumberFormatException e)
{
//if kilometers is not in number format
JOptionPane.showMessageDialog(panel, "Please enter numbers only");
}
}
}
  
});
panel.setPreferredSize(new Dimension(300, 190));//set preferrable size to panel

}
}

class WindowRunnable implements Runnable {

public void run() {
ActionWindow.createAndShowGUI();//show window
}
}

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OUTPUT

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