Multiple Choice Question

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Submitted by c-admin on Tue, 06/04/2019 - 22:09

QID:

473

Type:

Multiple Choice Question

Category:

Java Programmer I

Tags:

Looping Constructs

Question:

Which of the following are true about the enhanced for loop?

Select 3 options

A. It can iterate over an array or a Collection but not a Map.
B. Using an enhanced for loop prevents the code from going into an infinite loop
C. Using an enhanced for loop on an array may cause infinite loop.
D. An enhanced for loop can iterate over a Map.
E. You cannot find out the number of the current iteration while iterating.

Answer and Explanation (Click to expand)

Answer:

A, B, E

Explanation:

A - The enhanced for loop needs either an array or any object that implements Collection interface. Map does not implement Collection interface, though you can use Map.getKeySet() or Map.values() to get a Collection and then iterate over that Collection.

B - Since there is no explicity condition check written in the code, it provides less opportunity to write code that causes infinite loop.

E -

Unlike in a regular for loop, there is no iteration variable available in an enhanced for loop, so it is not possible to determine the number of the iteration just by using the enhanced for loop. You will need to do something like:
int i = 0;
for(Object obj : collection Or Array){ System.out.println("Iteration number = "+i+" Object = "+obj);
i++;
}

Q&A Set:

Set 19

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