Looping is one of the most fundamental concepts in any programming language, allowing tasks to be repeated until certain conditions are met. For those looking to test or enhance their knowledge, we’ve assembled a set of Multiple Choice Questions (MCQs) related to Java loops.
1. Which Java loop evaluates its condition at the beginning?
Answer:
Explanation:
The for loop evaluates its condition at the beginning, even before its first iteration. If the condition is false initially, the loop body may never execute.
2. What guarantees that a loop will run at least once?
Answer:
Explanation:
In a do-while loop, the body executes first, and the condition is checked afterward, ensuring at least one iteration.
3. Which loop is most suitable for iterating through arrays and collections?
Answer:
Explanation:
The for loop, especially the enhanced for loop, is tailored for sequential traversal of arrays and collections.
4. What will a break do inside a loop?
Answer:
Explanation:
The break statement exits the current loop or switch block.
5. If you want to skip to the next iteration without exiting the loop, which keyword would you use?
Answer:
Explanation:
The continue statement skips the current iteration and jumps to the next one.
6. How many times will a for loop run if the condition is false from the start?
Answer:
Explanation:
If the condition in a for loop is false initially, the loop body won't execute even once.
7. What's the primary difference between a while loop and a do-while loop?
Answer:
Explanation:
The key distinction is where the condition check happens. In a while loop, it's at the beginning, while in a do-while loop, it's at the end.
8. In an enhanced for loop, is it possible to modify the current element?
Answer:
Explanation:
The enhanced for loop provides a read-only view, making element modification directly not possible.
9. Which loop is most efficient in Java?
Answer:
Explanation:
The efficiency of a loop depends on its application and how it's written, rather than the loop type itself.
10. Can a loop be nested inside another loop in Java?
Answer:
Explanation:
Java supports the nesting of any loop within another, facilitating complex iteration patterns.