What does compareto () do in java?
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What is the difference between abstract classes and interfaces?
What is a instance variable?
Can a class have multiple constructors?
What is finalize()?
Is a boolean variable?
Is empty string in java?
What is a boolean expression in java?
Can we use both this () and super () in a constructor?
Is ++ operator thread-safe in java?
What are the four versions of java?
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When do we need to use internal iteration? When do we need to use external iteration?