Explain wrapper classes in java?
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What is aggregation?
Explain about member inner classes?
Why method overriding is used?
What is singleton class example?
How do you add an element to a set in java?
Is java pass by value or pass by reference?
what is the main class of all the classes
Which characters are allowed to use as the second character of an identifier, and which characters are not allowed?
What are the legal operands of the instanceof operator?
What are 5 boolean operators?
What does this () mean in java?
Why is whitespace important?