Best Loop Construct for Known Number of Iterations:

Introduction:
In Java programming language, there are various loop constructs available to execute a set of statements repeatedly. Each loop construct has its own purpose and usage scenarios. When the number of iterations is known in advance, the best-suited loop construct is the for loop (option A).

Explanation:

1. for loop:
- The for loop in Java is used when the number of iterations is known in advance.
- It consists of three parts: initialization, condition, and increment/decrement.
- The loop executes until the condition becomes false.
- The initialization part is executed only once at the beginning of the loop.
- The condition is checked before each iteration, and if it evaluates to true, the loop body is executed.
- After each iteration, the increment/decrement part is executed.
- Example syntax:
```
for (initialization; condition; increment/decrement) {
// Statements to be executed
}
```
- The for loop is efficient and concise when the number of iterations is fixed.

2. while loop:
- The while loop is used when the number of iterations is not known in advance.
- It continues executing until the condition becomes false.
- The condition is checked before each iteration, and if it evaluates to true, the loop body is executed.
- Example syntax:
```
while (condition) {
// Statements to be executed
}
```
- The while loop is suitable when the number of iterations is uncertain or depends on some condition.

3. do-while loop:
- The do-while loop is similar to the while loop, but it guarantees the execution of the loop body at least once.
- It executes the loop body first and then checks the condition.
- If the condition is true, it continues executing; otherwise, it terminates.
- Example syntax:
```
do {
// Statements to be executed
} while (condition);
```
- The do-while loop is useful when the loop body must be executed at least once, regardless of the condition.

4. if-else statement:
- The if-else statement is not a loop construct; it is used for conditional branching.
- It allows executing a set of statements based on a condition.
- The if-else statement is not suitable for repeating a set of statements for a known number of iterations.

Conclusion:
In Java, when the number of iterations is known in advance, the best-suited loop construct is the for loop. It provides a concise and efficient way to execute a set of statements repeatedly for a fixed number of iterations.