Tag has methods getElement(), setElement().

TagWithBody extends Tag and has method doBody(). This is natural,
because TagWithBody is a Tag but also needs to be able to do its body.

XhtmlTag extends Tag and has methods setId(), setClass(). This is
natural because XhtmlTag is a Tag but needs a couple of additional
setter methods.

Here is the problem:
XhtmlTagWithBody needs getElement(), setElement(), doBody(), setId(),
setClass(). It's as if XhtmlTagWithBody should extend TagWithBody and
XhtmlTag, but can't. XhtmlTagWithBody can't reuse the work done in
XhtmlTag, because XhtmlTag extended Tag instead of TagWithBody.

Please suggest better ways to get this idea accomplished.

Java can't extend multiple classes but it can implement more than one
interface.  You can create interfaces for XhtmlTag and TagWithBody
(both extending Tag) and have XhtmlTagWithBody implement both.

See http://java.sun.com/docs/books/tutorial/java/interpack/usinginterface.html

secret901-ga

Instead of trying to use Inheritance, you can use Composition.
XhtmlTagBody can have Xhtml as composition and inherit from
TagWithBody. By doing so you can reuse XhtmlTag by composition and
doBody by Inheritance.

The better option would be to create your Own class and extend the Tab
Body Interface...Create a Static method in it..Call this method
directtly from whereever you require

I solved this to my satisfaction by not being so granular with the
classes. I made a Tag class that had doBody(). Some subclasses don't
make use of it, but that's OK.