Java - Calculator GUI woes

Here it is the same thing as you did, but much simplier .... also the functionality isn't implemented (action performed on each tiny little button) ...

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

/**
* @author Sorinel CRISTESCU
*/
public class SccCalculator extends JPanel {

JTextField output;

public SccCalculator () {
super (new GridBagLayout());

// first line ... the digits ...
GridBagConstraints c = new GridBagConstraints ();
c.gridx = 0;
c.gridy = 0;
c.ipadx = 6;
c.ipady = 6;
c.gridwidth = 7;
c.weightx = 100;
c.insets = new Insets (3,3,3,3);
c.fill = c.HORIZONTAL;

output = new JTextField("0");
output.setFont(new Font("Courier", Font.PLAIN, 14));
output.setHorizontalAlignment(SwingConstants.RIGHT );
this.add(output, c);

// second line ... NOBUTTON, Backspace, CE & C buttons
c.gridwidth = 1;
c.gridy = 1;
c.weightx = 1;
c.fill = c.NONE;
JButton nobut = new JButton(" ");
nobut.setBorder(BorderFactory.createEmptyBorder()) ;
nobut.setEnabled(false);
this.add(nobut, c);

c.gridx = 1;
c.gridwidth = 2;
c.weightx = 30;
c.fill = c.HORIZONTAL;
JButton backspace = new JButton("Backspace");
backspace.setForeground(Color.red);
this.add(backspace, c);

c.gridx = 3;
c.gridwidth = 1;
JButton ce = new JButton("CE");
ce.setForeground(Color.red);
this.add(ce, c);

c.gridx = 4;
c.gridwidth = 2;
JButton clear = new JButton("C");
clear.setForeground(Color.red);
this.add(clear, c);

// third line MC, 7, 8, 9, /, sqrt
c.gridy = 2;
c.gridx = 0;
c.gridwidth = 1;
c.weightx = 1;

JButton mc = new JButton("MC");
mc.setForeground(Color.red);
this.add(mc, c);
nobut.setPreferredSize(mc.getPreferredSize());

c.gridx = 1;
JButton seven = new JButton("7");
seven.setForeground(Color.blue);
this.add(seven, c);

c.gridx = 2;
JButton eight = new JButton("8");
eight.setForeground(Color.blue);
this.add(eight, c);

c.gridx = 3;
JButton nine = new JButton("9");
nine.setForeground(Color.blue);
this.add(nine, c);

c.gridx = 4;
JButton divide = new JButton("/");
divide.setForeground(Color.red);
this.add(divide, c);

c.gridx = 5;
JButton sqrt = new JButton("sqrt");
sqrt.setForeground(Color.blue);
this.add(sqrt, c);

// forth line MR, 4, 5, 6, *, %
c.gridy = 3;
c.gridx = 0;

JButton mr = new JButton("MR");
mr.setForeground(Color.red);
this.add(mr, c);

c.gridx = 1;
JButton four = new JButton("4");
four.setForeground(Color.blue);
this.add(four, c);

c.gridx = 2;
JButton five = new JButton("5");
five.setForeground(Color.blue);
this.add(five, c);

c.gridx = 3;
JButton six = new JButton("6");
six.setForeground(Color.blue);
this.add(six, c);

c.gridx = 4;
JButton multiply = new JButton("*");
multiply.setForeground(Color.red);
this.add(multiply, c);

c.gridx = 5;
JButton procent = new JButton("%");
procent.setForeground(Color.blue);
this.add(procent, c);

// fifth line MS, 1, 2, 3, ., +, =
c.gridy = 4;
c.gridx = 0;

JButton ms = new JButton("MS");
ms.setForeground(Color.red);
this.add(ms, c);

c.gridx = 1;
JButton one = new JButton("1");
one.setForeground(Color.blue);
this.add(one, c);

c.gridx = 2;
JButton two = new JButton("2");
two.setForeground(Color.blue);
this.add(two, c);

c.gridx = 3;
JButton three = new JButton("3");
three.setForeground(Color.blue);
this.add(three, c);

c.gridx = 4;
JButton minus = new JButton("-");
minus.setForeground(Color.red);
this.add(minus, c);

c.gridx = 5;
JButton divideby = new JButton("1/x");
divideby.setForeground(Color.blue);
this.add(divideby, c);

// sixth line M+, 0, +/-, ., +, =
c.gridy = 5;
c.gridx = 0;

JButton mplus = new JButton("M+");
mplus.setForeground(Color.red);
this.add(mplus, c);

c.gridx = 1;
JButton zero = new JButton("0");
zero.setForeground(Color.blue);
this.add(zero, c);

c.gridx = 2;
JButton plusminus = new JButton("+/-");
plusminus.setForeground(Color.blue);
this.add(plusminus, c);

c.gridx = 3;
JButton dot = new JButton(".");
dot.setForeground(Color.blue);
this.add(dot, c);

c.gridx = 4;
JButton plus = new JButton("+");
plus.setForeground(Color.red);
this.add(plus, c);

c.gridx = 5;
JButton egal = new JButton("=");
egal.setForeground(Color.blue);
this.add(egal, c);

}

/**
* @param args
*/
public static void main(String[] args) {
// try {
// UIManager.setLookAndFeel(UIManager.getSystemLookAn dFeelClassName());
// } catch (Exception cnfe) {
// System.out.println("Error, Error, Error'");
// }

SccCalculator panel = new SccCalculator ();
JDialog dlg = new JDialog ();
dlg.setTitle("Simple Calculator");
dlg.getContentPane().add (panel);
dlg.pack();
dlg.setModal(true);
dlg.setResizable(false);
dlg.setVisible(true);
System.exit(0);
}

}

well sample action listener for buttons 7,8,9 is added.

rest do yourself by implementing logic.
Different actionlistener for each button is also possible.

Now that's some thread digging.