AppletTalk.com

tmilewski@gmail.com · Guest

Can someone please help me... I've been trying, and searching, for a
way to convert my Application to an Applet. I cant figure it out, it
just never wants to work.

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

public class GUI extends JFrame implements ActionListener {

private JTextField txtIO;
private double result = 0.0;
private double reset = 0.0;

public static final String[] numbers = { "1", "2", "3", "4", "5",
"6", "7", "8", "9", "0" };
public static final String[] functions = { "+", "-", "*", "/", "CE"
};

/////////////////////////////////////////////////////
// Method: main
// Calls GUI
/////////////////////////////////////////////////////
public static void main(String []args) {
GUI calculator = new GUI();
}

/////////////////////////////////////////////////////
// Method: GUI
// Constructs the Graphic User Interface
/////////////////////////////////////////////////////
public GUI() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JFrame cp = new JFrame("GUI Calculator by Tom Milewski");

//Set Layout ------------------------------------
JPanel bpMain = new JPanel(new GridLayout(4, 3));
JPanel bpFunc = new JPanel(new GridLayout(3, 2)); //row, col
JPanel tpScreen = new JPanel();

//bpMain Buttons --------------------------------
JButton btnMain;
for (int i = 0; i < numbers.length; i++) {
btnMain = new JButton(numbers[i]);
btnMain.addActionListener(this);
bpMain.add(btnMain);
}

//bpFunc Buttons --------------------------------
JButton btnFunc;
for (int i = 0; i < functions.length; i++) {
btnFunc = new JButton(functions[i]);
btnFunc.addActionListener(this);
bpFunc.add(btnFunc);
}

//txtIO Field -----------------------------------
txtIO = new JTextField("Press CE To Continue", 23);
tpScreen.add(txtIO);

//Add Content -----------------------------------
cp.getContentPane().add(tpScreen, BorderLayout.NORTH);
cp.getContentPane().add(bpMain, BorderLayout.CENTER);
cp.getContentPane().add(bpFunc, BorderLayout.WEST);
cp.pack();
cp.setVisible(true);
}

/////////////////////////////////////////////////////
// Method: actionPerformed
// Trys/Catches NumberFormatException Errors,
// Calls tryingCorrectNumberFormats
/////////////////////////////////////////////////////
public void actionPerformed(ActionEvent e) {
try {
tryingCorrectNumberFormats(e);
} catch(NumberFormatException e2) {
txtIO.setText("Error: Press CE To Continue");
}
}

/////////////////////////////////////////////////////
// Method: tryingCorrectNumberFormats
// Executes the appropriate function
/////////////////////////////////////////////////////
public void tryingCorrectNumberFormats(ActionEvent e) {
if(e.getActionCommand().equals("+")) { // ADDITION
double input = stringToDouble( txtIO.getText() );
result = result+input;
txtIO.setText(Double.toString(result));

} else if(e.getActionCommand().equals("-")) { // SUBTRACTION
double input = stringToDouble( txtIO.getText() );
result = result-input;
txtIO.setText(Double.toString(result));

} else if(e.getActionCommand().equals("*")) { // MULTIPLICATION
double input = stringToDouble( txtIO.getText() );
result = result*input;
txtIO.setText(Double.toString(result));

} else if(e.getActionCommand().equals("/")) { // DIVISION
double input = stringToDouble( txtIO.getText() );
if(input != 0) {
result = result/input;
txtIO.setText(Double.toString(result));
} else {
txtIO.setText("Divide By Zero Error: Press CE To
Continue");
}
} else if(e.getActionCommand().equals("CE")) { // CE
txtIO.setText(Double.toString(0.0));
} else { // Numbers - Error
if(stringToDouble(e.getActionCommand()) >= 0 &&
stringToDouble(e.getActionCommand()) <= 9) {
txtIO.setText(e.getActionCommand());
} else {
txtIO.setText("Error: Press CE To Continue");
}
}
}

/////////////////////////////////////////////////////
// Method: tryingCorrectNumberFormats
// Executes the appropriate function
/////////////////////////////////////////////////////
private static double stringToDouble(String stringObject) {
return Double.parseDouble(stringObject.trim());
}
}

tmilewski@gmail.com · Guest

--- also, I do understand that this is not an applet ... i posted the
original application.

Roedy Green · Guest

On 22 Nov 2005 16:57:06 -0800, [email]tmilewski (AT) gmail (DOT) com[/email] wrote, quoted or
indirectly quoted someone who said :

Fabien Bergeret · Guest

Your GUI class should not extend JFrame but JPanel.
Then you would have your application class extending JFrame and adding
your GUI in it, and you applet class doing the same.

Roedy Green · Guest

On Wed, 23 Nov 2005 11:48:55 +0100, Fabien Bergeret
<fabien.bergeret (AT) asupprimer (DOT) laposte.net> wrote, quoted or indirectly
quoted someone who said :

sanjay manohar · Guest

Really? So I should add the JApplet to the JFrame for a standalone...
So who calls the JApplet start(), init() etc.? or should I place only
the applet-specific stuff in those methods?

Thomas Fritsch · Guest

sanjay manohar wrote:

Roedy Green · Guest

On 24 Nov 2005 08:46:01 -0800, "sanjay manohar"
<sgmanohar (AT) hotmail (DOT) com> wrote, quoted or indirectly quoted someone who
said :