What is keyset in java?

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When should we create our own custom exception classes?

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What is a byte array?

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Can a class have multiple superclasses?

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What is thread life cycle?

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Is a class subclass of itself?

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If a multi threaded Java program has started numerous number of threads, at any point in time how to know which thread is currently executing/running ?

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Can Java be said to be the complete object-oriented programming language

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Can constructor be static or final?

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What does sprintf return?

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What does you mean in math?

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List down the methods and interfaces of collection class in java.

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