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Java interview questions
 
Question 1   What is mutable object and immutable object

You cannot modify or change the value of an immutable object where as you can change the state or value of a mutable object. string is an immutable object whereas stringbuilder is a mutable object. when you try to change the value of a string it actually creates a new string object



Question 2   What is the purpose of void class

A void class holds a reference to the class object which represents void type. we cannot create objects of such classes. the basic purpose of void class is reflection




Question 3   What is a package

The mechanism of organizing similar set of classes and interfaces to a namespace is called as packaging in java. packages are useful to avoid naming conflicts and also to locate classes very easily. java.lang, java.net are some examples of packages in java



Question 4   What is skeleton and stub

Stub and skeleton are two standard objects for communication in remote method invocation (rmi) or remote procedure call (rpc). a stub in rpc represents a client side object whereas skeleton represents the server side object. a stub is a local representation or a proxy of the remote object.
when as method is invoked on the client it calls the stubs proxy method which in turn call the skeleton method



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