GUI Calculator (Swing, BorderLayout, etc.)

Question

I am a bit of a crossroads and am needing some advice. I am trying to create a Calculator in a Window (GUI) that looks similar to a keypad. I have three files that I am working on but cannot get any of them to compile without errors. I am confused as to what I have left out and/or where I have taken a wrong turn. I will post them below and would greatly appreciate any insight and/or direction as to how to make this work! Also, I have heard from a "birdie" that there may be some problems that occur if the files are compiled out of order....does this make sense to anyone? Thank you in
advance for any help--Christle
Constants.java file
//Christle Chumney
import java.awt.*;
public interface Constants
  Color FUNCTION_COLOR = Color.red;
  Color OPERATOR_COLOR = Color.blue;
  Color NUMBER_COLOR = Color.black;
}calculator.java file
//Christle Chumney
import java.awt.*;
public class Calculator  {
  public static void main(String[] args){
     theApp = new Calculator();
     theApp.init();
  public void init() {
    aWindow = new CalculatorFrame("My Calculator");
    aWindow.setBounds(10, 10, 250, 250);
    aWindow.setVisible(true); }
  private static CalculatorFrame aWindow;
  private static Calculator theApp;
}calculatorFrame.java file
//Christle Chumney
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.border.*;
import java.util.*;
public class CalculatorFrame extends JFrame implements Constants //, ActionListener
  private Calculator theApp;
  JPanel top, bottom;
  JTextField display;
  JButton button;
  // Constructor
  public CalculatorFrame(String title)
    setTitle(title);  // Set the window title
    this.theApp = theApp;
    JMenuBar swingMenuBar = new JMenuBar();
    JMenu swingMenu = new JMenu("swingMenu");
    JMenuItem swingMenuItem1, swingMenuItem2, swingMenuItem3;
     swingMenuBar.add(swingMenu);
     setJMenuBar(swingMenuBar);
    JMenu applicationMenu = new JMenu("Function");    // Create Application menu
    applicationMenu.setMnemonic('A');                    // Create shortcut
    // Construct the application pull down menu
    exitItem = applicationMenu.add("Exit");                // Add exit item
    exitItem.setAccelerator(KeyStroke.getKeyStroke('X',Event.CTRL_MASK ));
    applicationMenu.add(exitItem);
    menuBar.add(applicationMenu);                        // Add the file menu   
    makeButtons();
  public void makeButtons() {
    BorderLayout border = new BorderLayout();
    Container content = getContentPane();
    content.setLayout(border);
    top = new JPanel(new BorderLayout());
    display = new JTextField("");
    display.setEditable(false);
    display.setBackground(Color.white);
    display.setHorizontalAlignment(display.RIGHT);
    top.add(display);
    bottom = new JPanel();
    GridLayout grid = new GridLayout(5,4,5,5);
    bottom.setLayout(grid);
    bottom.add(button = new JButton("C"));
    button.setForeground(FUNCTION_COLOR);
    bottom.add(button = new JButton("<=="));
    button.setForeground(FUNCTION_COLOR);
    bottom.add(button = new JButton("%"));
    button.setForeground(OPERATOR_COLOR);
    bottom.add(button = new JButton("/"));
    button.setForeground(OPERATOR_COLOR);
    bottom.add(button = new JButton("7"));
    bottom.add(button = new JButton("8"));
    bottom.add(button = new JButton("9"));
    bottom.add(button = new JButton("*"));
    button.setForeground(OPERATOR_COLOR);
    bottom.add(button = new JButton("4"));
    bottom.add(button = new JButton("5"));
    bottom.add(button = new JButton("6"));
    bottom.add(button = new JButton("-"));
    button.setForeground(OPERATOR_COLOR);
    bottom.add(button = new JButton("1"));
    bottom.add(button = new JButton("2"));
    bottom.add(button = new JButton("3"));
    bottom.add(button = new JButton("+"));
    button.setForeground(OPERATOR_COLOR);
    bottom.add(button = new JButton("0"));
    bottom.add(button = new JButton("+/-"));
    bottom.add(button = new JButton("."));
    bottom.add(button = new JButton("="));
    button.setForeground(OPERATOR_COLOR);
     Container content = aWindow.getContentPane();
     content.setLayout(new BorderLayout());
     content.add(top, BorderLayout, NORTH);
     content.add(bottom, BorderLayout, CENTER);
  private JMenuBar menuBar = new JMenuBar();      // Window menu bar
  private JMenuItem exitItem;                       // application menu item 
}Thanks in advance (again)-
Christle

Answer 1

HERE R U .JAVA FILES AND THEY WORK FINE NOW NO ERRORS NOTHING JUST THAT U HAVE TO CODE THE EVENTS OF UR APPLICATION
ANYOTHER HELP U NEED UR MOST WELCOME
VIJAY
// CALCULATORFRAME.JAVA
//Christle Chumney
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.border.*;
import java.util.*;
public class CalculatorFrame extends JFrame implements Constants //,ActionListener
     private Calculator theApp;
     JPanel top, bottom;
     JTextField display;
     JButton button;
// Constructor
     public CalculatorFrame(String title)
          setTitle(title);
// Set the window title
          this.theApp = theApp;
          JMenuBar swingMenuBar = new JMenuBar();
          JMenu swingMenu = new JMenu("swingMenu");
          JMenuItem swingMenuItem1, swingMenuItem2, swingMenuItem3;     
          swingMenuBar.add(swingMenu);     
          setJMenuBar(swingMenuBar);
          JMenu applicationMenu = new JMenu("Function");
// Create Application menu
          applicationMenu.setMnemonic('A');
// Create shortcut
// Construct the application pull down menu
          exitItem = applicationMenu.add("Exit");
// Add exit item           exitItem.setAccelerator(KeyStroke.getKeyStroke('X',Event.CTRL_MASK ));           applicationMenu.add(exitItem);
          menuBar.add(applicationMenu);
// Add the file menu
          makeButtons();
public void makeButtons()
     BorderLayout border = new BorderLayout();
     Container content = getContentPane();
     content.setLayout(border);
     top = new JPanel(new BorderLayout());
     display = new JTextField("");
     display.setEditable(false);
     display.setBackground(Color.white);
     display.setHorizontalAlignment(display.RIGHT);
     top.add(display);
     bottom = new JPanel();
     GridLayout grid = new GridLayout(5,4,5,5);
     bottom.setLayout(grid);
     bottom.add(button = new JButton("C"));
     button.setForeground(FUNCTION_COLOR);
bottom.add(button = new JButton("<=="));
     button.setForeground(FUNCTION_COLOR);
     bottom.add(button = new JButton("%"));
     button.setForeground(OPERATOR_COLOR);
     bottom.add(button = new JButton("/"));
     button.setForeground(OPERATOR_COLOR);
     bottom.add(button = new JButton("7"));
     bottom.add(button = new JButton("8"));
     bottom.add(button = new JButton("9"));
     bottom.add(button = new JButton("*"));
     button.setForeground(OPERATOR_COLOR);
     bottom.add(button = new JButton("4"));
     bottom.add(button = new JButton("5"));
     bottom.add(button = new JButton("6"));
     bottom.add(button = new JButton("-"));
     button.setForeground(OPERATOR_COLOR);
     bottom.add(button = new JButton("1"));
     bottom.add(button = new JButton("2"));
     bottom.add(button = new JButton("3"));
     bottom.add(button = new JButton("+"));
     button.setForeground(OPERATOR_COLOR);
     bottom.add(button = new JButton("0"));
     bottom.add(button = new JButton("+/-"));
     bottom.add(button = new JButton("."));
     bottom.add(button = new JButton("="));
     button.setForeground(OPERATOR_COLOR);     
     Container content1 = this.getContentPane();     
     content.setLayout(new BorderLayout());
     content1.add(top, BorderLayout.NORTH);
     content1.add(bottom, BorderLayout.CENTER);
     private JMenuBar menuBar = new JMenuBar();
// Window menu bar
     private JMenuItem exitItem;
// application menu item
// CALCULATOR.JAVA
import java.awt.*;
public class Calculator
public static void main(String[] args)
{     theApp = new Calculator();
     theApp.init();
public void init()
aWindow = new CalculatorFrame("My Calculator");
aWindow.setBounds(10, 10, 250, 250);
aWindow.setVisible(true);
private static CalculatorFrame aWindow;
private static Calculator theApp;
// CONSTANTS.JAVA
import java.awt.*;
public interface Constants
Color FUNCTION_COLOR = Color.red;
Color OPERATOR_COLOR = Color.blue;
Color NUMBER_COLOR = Color.black;