Explain how hashmap works?
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can java object be locked down for exclusive use by a given thread? Or what happens when a thread cannot acquire a lock on an object? : Java thread
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Can a class have multiple subclasses?
What is integers and example?
Which is better list or arraylist in java?
What is object english?
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Given a singly linked list, determine whether it contains a loop or not without using temporary space?
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