this program is 2 classes and it has 2 JLabels, 2 JTextFileds, and 2 JButtons...
it convert temperatures from Fahrenheit to Celsius and from Celsius to Fahrenheit..

Class 1:

// Author: Helen Toma

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import javax.swing.JTextField;
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;

public class ConvertTemp extends JFrame {
	// instance variables 
	JLabel labelFahr;
	JLabel labelCels;
	JTextField textFahr;
	JTextField textCels;
	JButton conFahToCel;
	JButton conCelToFah;
	public ConvertTemp () {
		super ("Temerature");
		setLayout (new FlowLayout ());
		labelFahr = new JLabel ("Fahrenheit: ", SwingConstants.LEFT);
		labelFahr.setToolTipText("This is a temerature scale");
		add (labelFahr);
		textFahr = new JTextField (10);
		add (textFahr);
		labelCels = new JLabel ("Celsius:       ", SwingConstants.LEFT);
		labelCels.setToolTipText("This is a scale and unit of measurement for temperature");
		add (labelCels);
		textCels = new JTextField (10);
		add (textCels);
		conFahToCel = new JButton ("Convert Fahrenheit to Celsius");
		add (conFahToCel);
		conCelToFah = new JButton ("Convert Celsius to Fahrenheit");
		add (conCelToFah);
		JPanel panel = new JPanel(new GridLayout(2, 2, 12, 6));
		add(panel, BorderLayout.NORTH);
		JPanel buttonPanel = new JPanel();
		add(buttonPanel, BorderLayout.SOUTH);
		conFahToCel.addActionListener(new FahrListener ());
		conCelToFah.addActionListener(new CelsListener ());
	} // end constructor 
	private class FahrListener implements ActionListener {
		public void actionPerformed(ActionEvent event) {
			if (event.getSource() == conFahToCel){
				int conFahToCel = (int) ((5.0/9.0 * (((Double.parseDouble(textFahr.getText())) -32))));
				textCels.setText(conFahToCel + " °C");
			} // end if statement
		} // end actionPerformed
	} // end FahrListener
	private class CelsListener implements ActionListener {
		public void actionPerformed(ActionEvent event) {
			if (event.getSource() == conCelToFah){
				int conCelToFah = (int) (( 9.0/5.0 * (((Double.parseDouble(textCels.getText())) + 32))));
				textFahr.setText(conCelToFah + " °F");
			} // end if statement
		} // end actionPerformed
	} // end CelsListener
} // end class ConvertTemp


Class 2:

// Author: Helen Toma

import javax.swing.JFrame;

public class ConvertTempTest {

	public static void main(String[] args) {
		ConvertTemp app = new ConvertTemp ();
		app.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
		app.setSize (500, 150); // set the frame size
		app.setVisible (true); // display frame

	} // end main method

} // end class ConvertTempTest

Edited by peter_budo: Keep It Clear - Do use code tags when posting any code

6 Years
Discussion Span
Last Post by JamesCherrill

Do you have any questions or problems about the posted code?

Please edit your post and wrap the code in code tags. Use the [code] icon above the input box.

Edited by NormR1: n/a

textCels.setText(conFahToCel + " °C");
textFahr.setText(conCelToFah + " °F");

Hint: Make sure to strip all non-numeric characters before converting strings to double.


Can ask you a few question
How to do the convert units ?
I need to create a GUI applet to convert units
The required to provide conversion for at least 8 categories each with a minimum of 2 conversion items for each category.


How to code the GUI applet convert units ?
I want to code using netbeans code Fahrenheit to Celcius .
And how to shows the result ? Can you please help me .

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