Why do we need singleton class?
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Write a program to show whether a graph is a tree or not using adjacency matrix.
Is it safe for adding 10,00,000 records/objects to HashMap?, i.e is it safe to add millions of objects to HashMap?
What are methods of a class?
What are implicit objects in java?
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What are byte codes?
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When should I use singleton pattern?
Where is stringbuffer stored?
Is break statement can be used as labels in java?