Reflection, or “A Class Named Class” - Java - page 940

/** put a Field's information to the standard output. */
protected

protected void void putField ( Field fld , Class <?> c ) {

println ( fld . getName () + " field " + c . getName () + " " );

}

/** put a Method's information to the standard output. */
protected

protected void void putMethod ( Method method , Class <?> c ) {

String methName = method . getName ();
println ( methName + " method " + c . getName () + " " );

}

/** Print the start of a class. Unused in this version,
* designed to be overridden */
protected protected void void startClass ( Class <?> c ) {

}

/** Print the end of a class. Unused in this version,
* designed to be overridden */
protected

protected void void endClass () {

}

/** Convenience routine, short for System.out.println */
protected protected final void println ( String s ) {

System . out . println ( s );

final void

}

}

You probably noticed the methods startClass() and endClass() , which are null. These
methods are placeholders designed to make subclassing easy for when you need to write
something at the start and end of each class. One example might be a fancy text formatting
application in which you need to output a bold header at the beginning of each class. Another
would be XML (see Chapter 20 ), where you'd want to write a tag like <class> at the front
of each class, and </class> at the end. Example 23-22 is, in fact, a working XML-specific
subclass that generates (limited) XML for each field and method.

Example 23-22. CrossRefXML.java
public public class class CrossRefXML CrossRefXML extends extends CrossRef {

public public static static void void main ( String [] argv ) throws throws IOException {

CrossRef xref = new new CrossRefXML ();

xref . doArgs ( argv );

}

/** Print the start of a class.