Java Programming and Technical Programming Definition

Q. What is the purpose of Void class?

A. The Void class is an uninstantiable placeholder class to hold a reference to the Class object representing the primitive Java type void.

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Java Other Question

Q. What is mutable object and immutable object?

A. If a object value is changeable then we can call it as Mutable object. (Ex., String Buffer, If you are not allowed to change the value of an object, it is immutable object. (Ex., String, Integer, Float, -) Q. What is JIT and its use?

A. Really, just a very fast compiler In this incarnation, pretty much a one-pass compiler - no offline computations. So you can't look at the whole method, rank the expressions according to which ones are re-used the most, and then generate code. In theory terms, it's an on-line problem