GUI convert to celsius program

Expert:lancau
how to write java GUI program to convert Fahrenheit to Celsius that need user to input value of Fahrenheit then click button convert and value of Celsius will display as a output.

Answers

Hi friend,

Code to convert Fahrenheit to Celsius :

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

public class TemperatureConverterInSwing implements ActionListener {

JFrame frame;
JPanel panel;
JTextField fahrenheitText;
JLabel celLabel, fahLabel;
JButton changeTemp;
JTextField celciusText;

public TemperatureConverterInSwing() {

frame = new JFrame("Change Celsius to Fahrenheit");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(new Dimension(180, 80));

panel = new JPanel(new GridLayout(3, 2));
panel.setBorder(BorderFactory.createEmptyBorder(60,
60,
20,
60)
);
addItems();
frame.getRootPane().setDefaultButton(changeTemp);
frame.getContentPane().add(panel, BorderLayout.CENTER);
frame.pack();
frame.setVisible(true);
}
private void addItems() {
fahLabel = new JLabel("Fahrenheit", SwingConstants.LEFT);
fahrenheitText = new JTextField(20);

changeTemp = new JButton("Convert");
celLabel = new JLabel("Celcius", SwingConstants.LEFT);
celciusText = new JTextField(20);

changeTemp.addActionListener(this);
panel=new JPanel(new GridLayout(4,1));
panel.add(fahLabel);
panel.add(fahrenheitText);
panel.add(celLabel);
panel.add(celciusText);
panel.add(changeTemp);

celLabel.setBorder(BorderFactory.createEmptyBorder(5, 10, 5, 5));
fahLabel.setBorder(BorderFactory.createEmptyBorder(5, 10, 5, 5));
}
public void actionPerformed(ActionEvent event) {
String selected=fahrenheitText.getText();
if (selected.equals("")){
celciusText.setText("");
System.out.println("enter the fahrenheit value");
JOptionPane.showMessageDialog(null,"Enter the fahrenheit value");
}
else{
double f = Double.parseDouble(selected);
double c = (f - 32) / 1.8;
celciusText.setText(Double.toString(c));
}
}
private static void createAndShowGUI() {
JFrame.setDefaultLookAndFeelDecorated(true);
TemperatureConverterInSwing converter = new TemperatureConverterInSwing();
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}

For more information on Swing Examples visit to :

http://www.roseindia.net/java/example/java/swing/

Thanks

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