An Investment Tracker in Java

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Let's consider a somewhat simpler case in which it would be useful to have a class build our GUI for us Suppose that we want to write a program to keep track of the performance of our investments, for example, stocks, bonds, and mutual funds We want to display a list of our holdings in each category so that we can select one or more of the investments and plot their comparative performances Even though we can't predict in advance how many of each kind of investment we might own at any given time, we want a display that is easy to use for either a large number of funds (such as stocks) or a small number of funds (such as mutual funds) In each case, we want some sort of multiple choice display so that we can select one or more funds to plot If there is a large number of funds, we'll use a multichoice list box; if there are three or fewer funds, we'll use a set of check boxes We want our Builder class to generate an interface that depends on the number of items to be displayed and yet have the same methods for returning the results Our displays are shown in Figure 72 The first display, Figure 72(a), contains a large number of stocks, and the second, Figure 72(b), a small number of bonds Figure 72 (a) Display of stocks showing the list interface and (b) display of bonds showing the check box interface
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public abstract class multiChoice { //the abstract base class //from which the list box and check box choice panels //are derived private Vector choices; //array of labels public multiChoice(Vector choiceList) { choices = choiceList; //save list } //to be implemented in derived classes abstract public Panel getUI(); //return Panel of components abstract public String[] getSelected(); //get list abstract public void clearAll(); //clear all }
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The getUI method returns a Panel container that has a multiple choice display The two displays we're using here a check box panel and a list box panel are derived from this abstract class
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class listBoxChoice extends multiChoice
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Now, let's consider how we can build the interface to carry out this variable display We'll start with a multiChoice abstract class that defines the methods that we need to implement
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class checkBoxChoice extends multiChoice
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Then we create a simple Factory class that decides which of the following two classes to return:
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public class choiceFactory { multiChoice ui; //class returns a Panel containing //a set of choices displayed by one of //several UI methods public multiChoice getChoiceUI(Vector choices) { if (choicessize() <=3) //return a panel of check boxes ui = new checkBoxChoice(choices); else //return a multiselect list box panel ui = new listBoxChoice(choices); return ui; } }
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In the language of Design Patterns, this simple factory class is called the Director, and each actual class derived from multiChoice is a Builder
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Since we're going to need one or more builders, we might call our main class Architect or Contractor However, here we're dealing with lists of investments, so we'll just call it wealthBuilder In this main class, we create the user interface, consisting of a BorderLayout with the center divided into a 1-x-2 GridLayout The left part of the grid contains our list of investment types and the right an empty panel that we'll fill depending on the kinds of investments selected
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public class wealthBuilder extends JxFrame implements ListSelectListener, ActionListener { private JawtList stockList; //list of funds private JButton Plot; //plot command button private JPanel choicePanel; //right panel private multiChoice mchoice; //ui for right panel private Vector Bonds, Stocks, Mutuals; //3 lists private choiceFactory cfact; //the factory public wealthBuilder() { super("Wealth Builder"); setGUI(); buildStockLists(); cfact = new choiceFactory() } //-------------private void setGUI() {
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