What is an object in java?
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Why do inner class cannot have static declaration except static nested class?
What is the importance of hashcode() and equals() methods?
What does three dots mean in java?
What is a boolean in java?
Why synchronization is important in java?
What is HashTable?
What is json parser in java?
What is object data type?
What is the intersection and union methods?
When a lot of changes are required in data, which one should be a preference to be used? String or stringbuffer?
Is 0 a real number?
What is the use of toarray () in java?