How do loops in Java differ?

In Java, there are several types of loops, each designed for specific tasks:

• for: Used when the number of iterations is known in advance.
• while: Executes as long as the condition is true. The number of iterations is not known beforehand.
• do-while: Similar to while, but the code block executes at least once before the condition is checked.
• Enhanced for (for-each): Convenient for iterating over elements of arrays and collections without explicitly managing the index.

Here is a table with key differences:

Feature	for	while	do-while	Enhanced for
Is the number of iterations known?	Usually yes	No	No	Depends on the size of the collection/array
Condition check	Before the first iteration	Before the first iteration	After the first iteration	Implicit
Syntax	for (init; cond; update)	while (condition)	do { ... } while (condition);	for (type element : collection)
Index management	Explicit (usually)	Implicit or explicit	Implicit or explicit	Not present
Suitable for	Fixed number of repetitions	Unknown number of repetitions before execution	At least one execution, then based on condition	Iterating over collection/array elements

Code examples:

// for loop
for (int i = 0; i < 5; i++) {
    System.out.println("Iteration: " + i);
}

// while loop
int count = 0;
while (count < 3) {
    System.out.println("While count: " + count);
    count++;
}

// do-while loop
int doCount = 0;
do {
    System.out.println("Do-While count: " + doCount);
    doCount++;
} while (doCount < 2);

// enhanced for
int[] numbers = {1, 2, 3, 4, 5};
for (int number : numbers) {
    System.out.println("Number: " + number);
}

The choice of a specific loop depends on the logic of the task and whether the number of iterations is known in advance.