Which loop construct in Java is guaranteed to execute at least once?Optionswhile loopfor loopdo-while loopswitch loop

Analyzing the Options

1. While Loop: This loop checks its condition before executing the body. If the condition is false from the start, the loop may not execute at all.

2. For Loop: Similar to the while loop, this loop also checks its condition before executing the code inside. If the condition is false initially, it will not execute even once.

3. Do-While Loop: This loop ensures that its body executes at least once because the condition is checked after the execution of the loop's body.

4. Switch Loop: This is not a loop construct but a control statement used to select one of many blocks of code to be executed. It does not involve iterative execution like loops.

Conclusion

Given the characteristics of these constructs, the do-while loop is the only one that is guaranteed to execute at least once, regardless of the condition.

Final Answer

The correct option is do-while loop.