BreezySwing help requested (should be very simple)

Question

My final project for my beginning programming class is to create a calculator, much like the one built into Windows. It only needs to do what the basic one does, not the scientific.
All I have so far is the GUI. The buttons do nothing yet.
////////////////////////////-A-//////////////////////////////////
///////////////////////-CALCULATOR-//////////////////////////////
//////////////////////-FINAL PROJECT-////////////////////////////
//////////////////////////-FOR-//////////////////////////////////
///////////////////////-MR. KAU'S-///////////////////////////////
/////////////////-INTRODUCTION TO COMPUTERS-/////////////////////
//////////////////////////-CLASS-////////////////////////////////
//Imports
import javax.swing.*;
import BreezySwing.*;
//Title
public class Calculator extends GBFrame{
//Vars
private JButton CB, SevenB, EightB, NineB, DivideB, SquareRootB,
FourB, FiveB, SixB, TimesB, PercentB, OneB, TwoB, ThreeB, MinusB,
OneOverXB, ZeroB, NegativeB, DecimalB, AddB, EqualB;
private DoubleField Window;
//Constructor
public Calculator(){
//Fields
Window = addDoubleField   (0    ,1,1,5,1);
//Buttons
CB = addButton ("C" ,2,3,1,1);
SevenB = addButton ("7" ,3,1,1,1);
EightB = addButton ("8" ,3,2,1,1);
NineB = addButton ("9" ,3,3,1,1);
DivideB = addButton ("/" ,3,4,1,1);
SquareRootB = addButton ("sqrt" ,3,5,1,1);
FourB = addButton ("4" ,4,1,1,1);
FiveB = addButton ("5" ,4,2,1,1);
SixB = addButton ("6" ,4,3,1,1);
TimesB = addButton ("*" ,4,4,1,1);
PercentB = addButton ("%" ,4,5,1,1);
OneB = addButton ("1" ,5,1,1,1);
TwoB = addButton ("2" ,5,2,1,1);
ThreeB = addButton ("3" ,5,3,1,1);
MinusB = addButton ("-" ,5,4,1,1);
OneOverXB = addButton ("1/x" ,5,5,1,1);
ZeroB = addButton ("0" ,6,1,1,1);
NegativeB = addButton ("+/-" ,6,2,1,1);
DecimalB = addButton ("." ,6,3,1,1);
AddB = addButton ("+"  ,6,4,1,1);
EqualB = addButton ("=" ,6,5,1,1);
//Button Method, yo
public void buttonClicked (JButton buttonObj){
//EXE-CUTE-R OLO!!1!
public static void main (String[] args){
Calculator SCGUI = new Calculator();
SCGUI.setLookAndFeel("MOTIF");
SCGUI.setSize (250, 250);
SCGUI.setVisible (true);
} I'm sure there are easier ways to go about it than using BreezySwing, but that's what we were taught with, so... :sweat:
I'm drawing a total blank on how to do this with a single Field. If someone could guide me in the correct direction, it would be much appreciated. I'm not asking for someone to finish my program, maybe just make it so it will add, and from that I'll figure out the division, multiplication, sqrt, etc. etc.
Thanks in advance.

Answer 1

Alright.
I now seem to have come across a different problem. Being VERY new to Java, I am unable to make it so that the numbers 'add up' so to speak in the field. I press 5 and 5 shows up. I press 6, and 6 replaces the 5.
if (buttonObj == TwoB){
Window.setNumber(2.0);
}I know that using setNumber will end up replacing it, but I'm not even sure how to get it so that when I press the 5 key, then the 6 key, that 56 will be in the field.
Would I use getNumber, and then somehow add the setNumber? Should I not use setNumber at all?