Box Classes

Here is the UML diagram

I have also posted this on Git Hub. Also look at the comment to this blog to see a correction to the code offered by Mitchel

Here is the Box class

package com.spconger.Boxes;

public class Box {
 
 private int height;
 private int width;
 private int depth;
 
 public void setHeight(int height){
  this.height=height;
 }
 
 public int getHeight(){
  return height;
 }

 public int getWidth() {
  return width;
 }

 public void setWidth(int width) {
  this.width = width;
 }

 public int getDepth() {
  return depth;
 }

 public void setDepth(int depth) {
  this.depth = depth;
 }
 
 @Override
 public String toString() {
  // TODO Auto-generated method stub
  return "height: " + getHeight() + ", width: " + getWidth()
    + ", depth: " + getDepth();
 }
 
}

Here is the BoxManager class

package com.spconger.Boxes;

import java.util.ArrayList;

public class BoxManager {
 private ArrayList boxList;
 
 public BoxManager(){
  boxList=new ArrayList();
 }
 
 public void add(Box b){
  boxList.add(b);
 }
 
 public int getVolume(){
  int volume=0;
  int h=0, w=0, d=0;
  for(Box b:boxList){
   h = b.getHeight();
   w = b.getWidth();
   d = b.getDepth();
   volume += h * w * d;
  }
  //volume=h * w * d;
  return volume;
 }
 
 public int getVolume(int boxNumber){
  
  int volume=0;
  if (boxNumber <= boxList.size()){
  Box b = boxList.get(boxNumber);
  volume =b.getDepth() * b.getHeight() * b.getWidth();
  }
  return volume;
 }

}

Here is the MainForm class

package com.spconger.Boxes;
import javax.swing.*;

import java.awt.GridLayout;
import java.awt.event.*;

public class MainForm {
 
 //declare all the form elements
 private JFrame frame;
 private JPanel panel;
 private JLabel lblHeight;
 private JTextField txtHeight;
 private JLabel lblWidth;
 private JTextField txtWidth;
 private JLabel lblDepth;
 private JTextField txtDepth;
 private JLabel lblVolume;
 private JButton btnAdd;
 private JButton btnGetVolume;
 private JTextField txtBoxNumber;
 private JButton btnExit;
 
 private BoxManager bxManager;
 
 public MainForm(){
  //constructor
  //
  createFrame();
  bxManager=new BoxManager();
 }
 
 //create the frame
 private void createFrame(){
  frame = new JFrame();
  frame.setSize(300,300);
  createPanel();
  frame.add(panel);
  frame.setVisible(true);
 }
 
 //create the panel
 private void createPanel(){
  panel = new JPanel();
  panel.setLayout(new GridLayout(6,2,5,5));
  
  //make all the objects new
  lblHeight=new JLabel("Enter the Height");
  txtHeight=new JTextField();
  lblWidth=new JLabel("Enter the Width");
  txtWidth=new JTextField();
  lblDepth=new JLabel("Enter the Depth");
  txtDepth=new JTextField();
  btnAdd = new JButton("Add");
  btnAdd.addActionListener(new AddBox());
  btnGetVolume = new JButton("Get Volume");
  btnGetVolume.addActionListener(new GetBoxVolumes());
  txtBoxNumber = new JTextField();
  btnExit = new JButton("Exit");
  btnExit.addActionListener(new ExitEvent());
  lblVolume = new JLabel();
  
  //add them all to the panel
  panel.add(lblHeight);
  panel.add(txtHeight);
  panel.add(lblWidth);
  panel.add(txtWidth);
  panel.add(lblDepth);
  panel.add(txtDepth);
  panel.add(btnAdd);
  panel.add(btnGetVolume);
  panel.add(txtBoxNumber);
  panel.add(btnExit);
  panel.add(lblVolume);
  
 }
 //private classes to implement button actions
 private class ExitEvent implements ActionListener{

  @Override
  public void actionPerformed(ActionEvent arg0) {
   System.exit(0);
   
  }
  
 }
 
 private class AddBox implements ActionListener{

  @Override
  public void actionPerformed(ActionEvent e) {
   Box b = new Box();
   b.setWidth(Integer.parseInt(txtWidth.getText()));
   b.setDepth(Integer.parseInt(txtDepth.getText()));
   b.setHeight(Integer.parseInt(txtHeight.getText()));
   bxManager.add(b);
   txtHeight.setText("");
   txtWidth.setText("");
   txtDepth.setText("");
   
  }
  
 }
 
 private class GetBoxVolumes implements ActionListener{

  @Override
  public void actionPerformed(ActionEvent e) {
   int volume=0;
   //if (txtBoxNumber.getText() != null || !txtBoxNumber.getText().equals("")){
   // int boxIndex=Integer.parseInt(txtBoxNumber.getText());
    //volume=bxManager.getVolume(boxIndex);
   //}
  // else
   //{
    volume=bxManager.getVolume();
   //}
   lblVolume.setText("the volume is: " + volume);
  }
  
 }

}

Here is the Program class

package com.spconger.Boxes;

public class Program {

 /**
  * @param args
  */
 public static void main(String[] args) {
  //call main form that creates form
  MainForm form = new MainForm();

 }

}