What is the difference between interface & abstract class?

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What a static class can contains?

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What are abstract classes and anonymous classes?

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What are the differences between stringbuffer and stringbuilder?

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1.) if we use "private" in place of "public" in public static void main()... 2.) if we use "int" in place of "void".... 3.) can we ommit "static" keyword from that statement.... 4.) also can we give the command line arguments type as int type or float,etc.(.i.e (string args[]))

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what is run time polymorphism

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What are the observer and observable classes?

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What is oops in java?

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Is an empty arraylist null?

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what is wrapper class and its uses?

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Explain the importance of finally over return statement?

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What is the meaning of variables in research?

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