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Thread: need answer for these

  1. #1
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    Post need answer for these

    hi all . im new to this forum and java . I need answers for these questions cuz im not clear with them.

    1.What is a class? What is the difference between a class and an object?

    2.Does java support the concepts of multiple inheritance & pointers? If not why?

    3.What is a Null object?

    4.Which part of Java is platform independent ? Explain how Architecture neutral is achieved in Java.


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    Default Re: need answer for these

    What did a web search tell you? The answers are there, with probably a lot more detail than we can reiterate and within a few milliseconds rather than waiting for someone to respond. Just do the search
    Google: What is a class
    and if you have more specific questions feel free to ask

  3. #3
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    Default Re: need answer for these

    Quote Originally Posted by satishbs View Post
    3.What is a Null object?
    I will answer this one as many people misinterpret this and it may not be explained sufficiently.

    There is no such thing as a null object, only null references.
    Foo f = new F();
    In this code the variable f is not a Foo object. It is a variable that holds a reference to a Foo object. If you set the variable to null it becomes a null reference not a null object.

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