What is boolean data type in java?

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What is run-time class and system class? what is their purpose?

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Explain how to convert any java object into byte array.

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Is class is a data type?

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Can a class inherit the constructors of its superclass?

9 Answers   iFlex, Wipro,

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I have a sorting issue with a Hashmap. My constraint is that I MUST use the Hashmap and work with existing code. I do a database query and place the results in a Hashmap. When I iterate thru the Hashmap, it loses the original alphabetical sorting done by the database. So, my problem is that I must sort the results coming out of the Hashmap which is then placed into another class.

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What is difference between add() and addelement() in vector?

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What is logical variable?

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Can a class be protected in java?

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What is java string pool?

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How can constructor chaining be done using this keyword?

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What is java lang object?

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