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Core Java Interview Questions and Answers

Ques 206. What is DriverManager?

Ans. The basic service to manage set of JDBC drivers.

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Ques 207. What is Class.forName() does and how it is useful?
Ans. It loads the class into the ClassLoader. It returns the Class. Using that you can get the instance ( 'class-instance'??.newInstance() ).
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Ques 208. What is the purpose of finalization?
Ans. The purpose of finalization is to give an unreachable object the opportunity to perform any cleanup processing before the object is garbage collected.
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Ques 209. What is the difference between the Boolean & operator and the && operator?
Ans. If an expression involving the Boolean & operator is evaluated, both operands are evaluated. Then the & operator is applied to the operand. When an expression involving the && operator is evaluated, the first operand is evaluated. If the first operand returns a value of true then the second operand is evaluated. The && operator is then applied to the first and second operands. If the first operand evaluates to false, the evaluation of the second operand is skipped.
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Ques 210. How many times may an object's finalize() method be invoked by the garbage collector?
Ans. An object's finalize() method may only be invoked once by the garbage collector.
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