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Source from Zend Technologies, http://www.zend.com/zend/php5/php5-OOP.php?article=php5-OOP&kind=ph&id=3204&open=1&anc=0&view=1
== Real-life Application Applications ==
=== Apache Excalibur=== The following examples shows that class CascadingErrorTestCase is extending from an abstract class called TestCase, possibly in the junit.framework.TestCase package.
The following are portions of the code found in [http://www.google.com/codesearch?hl=en&q=show:b65X65FJv3k:tIVs6rnDDGE:CuwdO4_VJq8&sa=N&ct=rd&cs_p=https://svn.apache.org/repos/asf/excalibur/trunk&cs_f=framework/api/src/test/org/apache/avalon/framework/test/CascadingErrorTestCase.java[CascadingErrorTestCase.java]] and [http://www.google.com/codesearch?hl=en&q=show:5CjVErg7uPw:tIVs6rnDDGE:W66LfbDC3n0&sa=N&ct=rd&cs_p=https://svn.apache.org/repos/asf/excalibur/trunk&cs_f=framework/api/src/test/org/apache/avalon/framework/test/CascadingExceptionTestCase.java[CascadingEexceptionTestCase.java]] files.<br/><br/>
When comparing these two files, we can see that the two files share a common package '''org.apache.avalon.framework.test'''.
<pre>
package org.apache.avalon.framework.test;
import junit.framework.TestCase;
</**pre> * From the following, we can see that the class '''CascadingErrorTestCase''' is extending from an abstract class called '''TestCase'''. This is the same case in the '''CascadingExceptionTestCase.java''' file. Hence, this shows that these two classes are subclasses of the class '''TestCase for {@link CascadingError}'''. * * @author <a href="mailto:dev@avalon.apache.org">Avalon Development Team</apre> * @version $Id$ */
public class CascadingErrorTestCase extends TestCase
{
}
</pre>
When looking at the testConstructor() in both files, we can see that it implements different methods, therefore its altering the algorithm operation of the file. Therefore we can conclude that the general steps in the constructor is not altered, but the implementation is different.
<pre>
// From CascadingErrorTestCase.java
public void testConstructor()
{
//assertNotNull( new CascadingError() );
}
</pre><pre> // From CascadingExceptionTestCase.java public void testGetCausetestConstructor()
{
The following are portions of the code found in [https://svn.apache.org/repos/asf/tomcat/connectors/trunk/jk/java/org/apache/jk/common/Shm.java[Shm.java]] and[https://svn.apache.org/repos/asf/tomcat/connectors/trunk/jk/java/org/apache/jk/common/Shm14.java[Shm14.java]]<br/><br/>Looking at the '''Shm14.java''', we can conclude that '''Shm.java''' is the base class while ''''Shm14.java'''' is the subclass. In addition, ''''Shm.java''' also extends to '''JniHandler''', making it a subclass of that class.<pre>// From Shm14.javapublic class Shm14 extends Shm {}</pre><pre>// From Shm.javapublic class Shm extends JniHandler {}</pre>From the file '''Shm.java''', the following method is given. <pre> public void testCasts int invoke(Msg msg, MsgContext ep ) throws IOException
{
// return 0; }
</pre>
Source from [https://svn.apache.org/repos/asf/tomcat/connectors/trunk/jk/java/org/apache/jk/common/ | Apache Tomcat Sample Code via Google Code Search]
== References ==
Gamma, Erich; Helm, Richard; Johnson, Ralph; Vlissides, John (1994). Design Patterns: Elements of Reusable Object-Oriented Software. Addison-Wesley. ISBN 0-201-63361-2.<br/>
[http://en.wikipedia.org/wiki/Template_method_pattern| Template Method on Wikipedia]<br/><br/><br/>
[[BTP600|BTP600 Wiki Page]]<br/>
