what is the difference between pass by reference and call by reference?

Question

what is the difference between pass by reference and call by reference in java ?

Answer 1

Important concept - Java has no concept of "pass by reference". Everything in Java is passed by value. When you pass an object reference to a parameter in a method call, what you are really doing it is passing a value that points to the reference of your object.

The following URLs explain this in greater detail: http://www.javaworld.com/javaworld/javaqa/2000-05/03-qa-0526-pass.html and http://javadude.com/articles/passbyvalue.htm?repost

Apparently (as noted in comments to your question) the terms "pass by reference" and "call by reference" mean the same thing.