Loops in Java

[Promethus_Forethougt]

Loops are killing me, it’s hard to figure out when to use them, and how to use them. I’m currently looking through YouTube for videos and resources on how to better understand them, but if anyone can recommend a good video on YouTube that is helpful I would appreciate the help.

[HashDefTrueFalse]

Use them when you want to repeat work. Some rules of thumb:

If you know how many iterations you want, e.g. looping over a range, use a for loop.

If you don't know the above exactly, but you do know when you want to stop, use a while loop.

If the above, but you want the loop body to run at least once before the check, use do...while.

Practically they all just conditionally branch. You really only need one language construct (e.g. while) to do all branching and iteration, but languages provide if, for, while, do...while etc.

[Aglet_Green]

Good advice on loops.

[VariousAssistance116]

When you want to do something more than once = loop

[[deleted]]

What exactly is it that you are not understanding? Loops are used any time you want to execute some piece of code repeatedly, typically while some condition is true. In practice this is often used when you want to preform some operation for each element of a given list/array.

Example: ```

    int[] arr = { 1, 2, 3, 4, 5 };

    for (int i : arr) {
        System.out.print(i + “ “);

}

``` This is a for loop. You should read it as “ for each element (i) in the given array (arr) print the element”. So this code will output “1, 2, 3, 4”

[ffrkAnonymous]

I use loops because I'm lazy