/*
 *  ============================================================================
 *  Celsius.java : Windows version of Celsius to Farenheit Converter Program
 *
 *  Written By : David Chancogne                                  September 1997
 *  ============================================================================
 */

import java.lang.Math;
import java.util.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;

class TempConversion extends Frame {
TextField   CelText;
TextField FarenText;
Button    CelButton;
Button  FarenButton;
Button   QuitButton;

    // The main method just creates an instance of the class

    public static void main( String args[] ) {
       System.out.println("Celsius to Farenheit Converter Program");
       TempConversion p = new TempConversion();

    } 

    // The constructor creates the window.

    public TempConversion() {

        setTitle("Temperatures Converter");

        CelButton   = new Button("Celsius");
        FarenButton = new Button("Farenheit");
        QuitButton  = new Button("Quit");

        CelText   = new TextField(7);
        FarenText = new TextField(7);

        setLayout(new GridLayout(3,2));

        add(CelButton);    add(CelText);
        add(FarenButton);   add(FarenText);
        add(QuitButton);

        // Add listeners for the various components

        QuitButton.addMouseListener(new QuitListener());
        CelText.addKeyListener(new CelListener(CelText, FarenText));
        FarenText.addKeyListener(new FarenListener(CelText, FarenText));

        // Set the window size and display it.

        setSize(450,150);
        show();

    } 

    // The temperature conversion methods.

    public static float CelsiusToFarenheit(float fCel) {
        return (float)(9.0/5.0 * fCel + 32.0);
    }

    public static float FarenheitToCelsius(float fFahrn) {
        return (float)(5.0/9.0 * (fFahrn - 32.0) );
    }

} 

/*
 *  ===================================================================
 *  The following classes handle the events.
 *
 *      -- 1 class extends the MouseAdapter class and is attached to
 *         the "Quit" button.
 *
 *      -- 2 classes extend KeyAdapter and are listening for input from
 *         the TextFields.
 *  ===================================================================
 */

class QuitListener extends MouseAdapter {
    public void mouseReleased(MouseEvent e) {
       System.out.println("Thank you !");
       System.exit(0);

    } 
} 

class CelListener extends KeyAdapter {
    TextField CelText;
    TextField FarenText;

    public CelListener( TextField c, TextField f ) {
        CelText   = c;
        FarenText = f;
    } 

    public void keyReleased(KeyEvent e) {

        // Keyboard event is release of the 'return' key

        if ( e.getKeyCode() == KeyEvent.VK_ENTER ) {
             float f = 0 ; // The method are 'static' so we can call
                           // them without an instance
             try {
                 f = TempConversion.CelsiusToFarenheit(
                         Float.valueOf(CelText.getText()).floatValue()
                     );
             } catch (Exception ex) {
                 System.out.println("Malformated number !");
             }

             FarenText.setText(Float.toString(f));
        } 

    } 
} 

class FarenListener extends KeyAdapter {
    TextField CelText;
    TextField FarenText;

    public FarenListener( TextField c, TextField f ) {
        CelText   = c;
        FarenText = f;
    } 

    public void keyReleased(KeyEvent e) {

        // Keyboard event is release of the 'return' key

        if ( e.getKeyCode() == KeyEvent.VK_ENTER ) {
             float f = 0;    // The method are 'static' so we can call
                             // them without an instance
             try {
                 f = TempConversion.FarenheitToCelsius(
                         Float.valueOf(FarenText.getText()).floatValue()
                     );
             } catch (Exception ex) {
                 System.out.println("Malformated number !");
             }

             CelText.setText(Float.toString(f));
        } 
    }
}