SumUp is a simple applet that adds up some numbers. Java code example - Click here to copy ->>>

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Code:



 



/*

 * Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.

 * All rights reserved. Software written by Ian F. Darwin and others.

 * $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $

*/



import java.applet.*;

import java.awt.*;

import java.awt.event.*;

import java.net.*;



/**

 * <p>

 * SumUp is a simple applet that adds up some numbers.

 * To make this really useful for production, should implement a "little

 * language" either in HTML PARAMs, such as

 * <pre>

 *   <param name="title1" value="Option One">

 *   <param name="values1" value="0|100|200|300|400">

 *   <param name="title1" value="Option Two">

 *   <param name="values1" value="0|400|600|800|1000">

 * </pre>

 * <br/>or<br/>

 * in a configuration file which we download and parse (see

 * TreeLink.java in this directory) or load as a Properties file

 * (see MenuIntl.java). </p>

 * <p>

 * Also, of course, the URL to go to should be a PARAM.

 * Not to mention the colors (see ColorName and/or XColor).</p>

 * @author Ian F. Darwin, http://www.darwinsys.com/

 */

public class SumUp extends Applet implements ActionListener {

   /** The array of Choice items */

   protected Choice cs[] = new Choice[10];

   /** How many are actually in the array. */

   protected int numChoices = 0;

   /** The result of the summation */

   protected Label resultField;

   /** The pushbutton to send the form in */

   protected Button sendButton;



   /** init() is an Applet method called by the browser to initialize */

   public void init() {

      setBackground(Color.magenta);

      // The layout of the Applet is a Grid; always add things in pairs!

      setLayout(new GridLayout(0,2));

      Choice c;

      add(new Label("Option 1"));

      add(c = new Choice());

         c.addItem("0");

         c.addItem("100");

         c.addItem("200");

         c.addItem("400");

      cs[numChoices++] = c;



      add(new Label("Option 2"));

      add(c = new Choice());

         c.addItem("0");

         c.addItem("100");

         c.addItem("200");

         c.addItem("400");

      cs[numChoices++] = c;



      Panel p = new Panel();

      p.setBackground(Color.pink);

      p.add(new Label("Total:"));

      p.add(resultField = new Label("000000"));

      add(p);



      sendButton = new Button("Send it");

      add(sendButton);                  // connect Button into Applet

      sendButton.addActionListener(this);      // connect it back to Applet

   }



   /** actionPerforformed() is called when a "high level" action happens

    *  (like the user pushing a Button!) in one of the components

    *  added to this Applet.

    */

   public void actionPerformed(ActionEvent e) {   // 1.1

      int total = 0;

      for (int i=0; i<numChoices; i++) {

         String text = cs[i].getSelectedItem();

         // System.err.println("Selection " + i + " = " + text);

         int value = Integer.parseInt(text);

         total += value;

      }

      resultField.setText(Integer.toString(total));



      try {

         URL myNewURL = new URL(

            "http://server/cgi-bin/credit?sum=" + total);



         // System.out.println("URL = " + myNewURL); // debug...



         // "And then a miracle occurs..."

         getAppletContext().showDo*****ent(myNewURL);



      } catch (Exception err) {

         System.err.println("Error!\n" + err);

         showStatus("Error, look in Java Console for details!");

      }

   }

}