a2zinterviews

17.	What is the impact of private constructor?
	Private constructors prevent a class from being explicitly instantiated by callers.
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18.	What is Pass by Value and Pass by Reference?
	In Pass by Value the function or subroutine receives a copy of variable. The function or the method cannot change variable values. In Pass By Ref the function or subroutine receives a pointer of the variable. And any changes to variable value are also visible outside the function or subroutine.
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19.	Distinguish between process based multitasking and thread based multitasking?
	Process based multitasking is the feature that allows a computer to run two or more programs concurrently. In process based multitasking, a program is the smallest unit of dispatch able code. In thread based multitasking, a single program can perform two or more tasks simultaneously. In thread based multitasking, the thread is the smallest unit of dispatch able code. Process based multitasking deals with the 'big picture', and thread based multitasking handles the details.
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20.	What is Recursion?
	Recursion is the process of defining something in terms of itself. In other words, a method that calls itself is said to be recursive. The classic example of recursion is the computation of the factorial of a number.
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