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POJava Code Design Question and Example
 

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    <p>Hey everyone, I've been writing code in Java for awhile now, however I feel as though I lack in code "design" - that is, creating packages and separating classes and such. I'm just not sure when to create what.</p> <p>So, I'm practicing :)</p> <p>I am setting out to write a Calculator (with a Swing GUI), and I want to create a really good design for it.</p> <p>So far, I have created a package with the following:</p> <pre><code> com.kevin.Calculator &gt; com &gt; kevin &gt; calculator &gt; ui Swing_Calculator.java &gt;utilities </code></pre> <p>I want to separate out the UI from the functionality (the math).</p> <p>So far so good?</p> <p>My Swing_Calculator.java is, right now, creating the GUI elements, as well as running the user interface. However, should I be "breaking down" the creation of the GUI elements into more classes? As I said earlier - I don't seem to know when it is best to do modularize. Here is my code so far:</p> <pre><code> /** * */ package com.kevin.calculator.ui; import java.awt.Dimension; import java.awt.GridLayout; import java.awt.Panel; import javax.swing.*; /** * @author Kevin * */ public class Swing_Calculator { /** * Creates the calculator's GUI and shows it on screen. */ private static void create_GUI() { // Create and set up the window. JFrame frame = new JFrame("KBehr's Kalculator"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // Sets the size of the frame frame.setSize(300, 350); // Centers the frame on the screen // Should be called AFTER the frame size has been set frame.setLocationRelativeTo(null); // Creates a new Panel Object JPanel panel = new JPanel(); // Sets the size of the panel panel.setPreferredSize(new Dimension(300, 350)); // Creates a GridLayout object // http://java.sun.com/docs/books/tutorial/uiswing/layout/grid.html GridLayout button_grid = new GridLayout(0,3); // Adds the GridLayout to the Panel panel.setLayout(button_grid); // Adds the Panel to the Frame frame.getContentPane().add(panel); // Displays the window. frame.setVisible(true); } public static void main(String[] args) { // Schedule a job for the event-dispatching thread: // creating and showing this application's GUI. javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { create_GUI(); } }); } } </code></pre> <p>Can anyone offer some insight? Thanks!</p>
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    1. COyou'd usually not use underscores in names of classes in java - changing Swing_Calculator.java to camelCase SwingCalculator.java is much better.
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