What is the relationship of javatv api,jmf api and mhp api ?

Whether all these three set of API are required to write digital tv program?

That depends on what the digital TV program (I assume you mean MHP application) wants to do. Specifically;
- javax.tv.xlet.Xlet is needed whatever you want to do.
- Most of the rest of JavaTV is only needed if you want to write an electronic program guide, e.g. to get at service information.
- If you want to write a program which manipulates the video & audio of the TV signal then you need the JMF API and also a small part of javax.tv.service.selection to get hold of the JMF player for the running TV content.
- The MHP APIs do many different things, again depending on what your application wants to do.
- You don't mention them but you also probably need some of the org.havi.ui APIs. In MHP, the top level graphics Container class for applications is an instance of org.havi.ui.HScene. Also the "VK_" constants for some of the remote control codes are only defined in org.havi.ui.HRcEvent.
See http://www.mhp-interactive.org for examples of how to use many of the MHP APIs.

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