Not much to say, we all know Pong: two players, each controlling a paddle, hit a ball back and forth until one of them fails to return it:
My goal with this project was to learn a bit about iPhone game development. It uses Cocos2D for iPhone, an excellent open-source framework for building 2D games on the iPhone. I will certainly be returning to it for my next games.
Anyway, check out the source code for Copong on GitHub!
Another applet, this one dedicated to my beloved XSLT. It allows you to quickly test your XSLT stylesheet against a XML document.
Run the XSLT Tester Applet now!
Most of the code for this application is Swing-related stuff. The only two interesting pieces of code are those that deal with prettifying and transforming the XML document.
This method formats the XML so that it is easier to read, using the dom4j library:
public static String prettify(final String xml)
{
StringWriter output = new StringWriter();
try
{
OutputFormat format = OutputFormat.createPrettyPrint();
XMLWriter writer = new XMLWriter(output, format);
Document document = DocumentHelper.parseText(xml);
writer.write(document);
writer.flush();
}
catch (Exception e)
{
return xml;
}
return output.toString();
}
This method applies a XSLT stylesheet to a XML document, using the javax.xml.transform.Transformer class:
public static String transform(final Source xml, final Source xslt,
final Map params) throws TransformerException
{
TransformerFactory factory = TransformerFactory.newInstance();
Transformer transform = factory.newTransformer(xslt);
// optional parameters for the XSLT
if (params != null)
{
for (Iterator iter = params.entrySet().iterator(); iter.hasNext();)
{
Entry param = (Entry) iter.next();
transform.setParameter((String) param.getKey(), param.getValue());
}
}
StreamResult result = new StreamResult(new StringWriter());
transform.transform(xml, result);
return result.getWriter().toString();
}
Check out the source code for the XSLT Tester Applet on GitHub!
Out of my love for regular expressions comes this cool applet. It allows you to quickly test a regex before embedding it in your Java program.
Run the Java Regex Tester Applet now!
Most of the code for this application is Swing-related stuff. Probably the only interesting part is the one that deals with capturing regular expression groups. This snippet illustrates the process:
// simple email regex
String regex = "(?i)([A-Z0-9._%+-]+)@(([A-Z0-9.-]+)\\.([A-Z]{2,4}))";
String test = "spam@unindented.org";
// compile regex
Pattern pattern = Pattern.compile(regex);
// and match test string against it
Matcher matcher = pattern.matcher(test);
if (matcher.find())
{
StringBuffer capture = new StringBuffer();
do
{
// group zero always stands for the entire expression
capture.append(matcher.group(0) + "\n");
// remaining groups will be printed along with their index
for (int i = 1; i <= matcher.groupCount(); i++)
{
capture.append(i + ". " + matcher.group(i) + "\n");
}
capture.append("\n");
}
while (matcher.find());
// output results
System.out.println(capture.toString());
}
Which would output:
spam@unindented.org
1. spam
2. unindented.org
3. unindented
4. org
Check the java.util.regex.Pattern and java.util.regex.Matcher API specifications for in-depth information on regular expressions in Java.
And, of course, check out the source code for the Java Regex Tester Applet on GitHub!