modified RetirementCalculator class to work as an applet or a stand-alone java application

git-svn-id: svn://anubis/gvsu@430 45c1a28c-8058-47b2-ae61-ca45b979098e

cs623/proj1/Makefile

@@ -1,6 +1,12 @@
 
+MAINCLASS := RetirementCalculator
+
 all:
-	javac RetirementCalculator.java
+	javac $(MAINCLASS).java
+
+.PHONY: run
+run:
+	java $(MAINCLASS)
 
 clean:
 	-rm -f *.class

cs623/proj1/RetirementCalculator.java

@@ -1,15 +1,47 @@
 
 import java.awt.*;
+import java.awt.event.*;
 import javax.swing.*;
 import java.util.*;
 
+/*
+ * The main work of the application is done in this JPanel-extending class.
+ * This allows the java class to be run as a stand-alone application or
+ * as an applet within a web browser.
+ */
+class RetirementCalculatorPanel extends JPanel implements ActionListener
+{
+    private JButton b;
+
+    public RetirementCalculatorPanel()
+    {
+        setLayout(new BorderLayout());
+        b = new JButton("Hi There");
+        b.addActionListener(this);
+        add("South", b);
+    }
+
+    public void actionPerformed(ActionEvent e)
+    {
+        b.setEnabled(false);
+    }
+}
+
+/*
+ * The "main" class of this file allows the app to be run as an applet
+ * but also provides a "main" method to run as an application.
+ */
 public class RetirementCalculator extends JApplet
 {
+    final static private String PROG_NAME = "Josh's Retirement Calculator";
+
+    RetirementCalculatorPanel panel;
+
     public void init()
     {
         setLayout(new BorderLayout());
-        JButton b = new JButton("Hi");
-        add("South", b);
+        panel = new RetirementCalculatorPanel();
+        add(panel, BorderLayout.CENTER);
     }
 
     public void destroy()
@@ -23,4 +55,22 @@ public class RetirementCalculator extends JApplet
     public void stop()
     {
     }
+
+    public static void main(String[] args)
+    {
+        javax.swing.SwingUtilities.invokeLater(new Runnable() {
+            public void run()
+            {
+                JFrame frame = new JFrame(PROG_NAME);
+                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+
+                RetirementCalculatorPanel panel =
+                    new RetirementCalculatorPanel();
+                frame.getContentPane().add(panel);
+
+                frame.pack();
+                frame.setVisible(true);
+            }
+        });
+    }
 }