Thread: TO do OR NOT TO do

Do-while loops in my opinion is a great way to not have to manually create "one and a half" while loops.

Instead of having to copy and paste the same code into two different places with a while loop if you want it to execute at least once, you can simply put it into a do-while loop and manage the code this way.

public static void main(String[] args)
{
    // a one and a half while loop asking for user password
    String password;
    Scanner reader = new Scanner(System.in);
    System.out.println("Enter your new password:");
    password = reader.nextLine();
    do
    {
        System.out.println("Re-enter your password: ");
    }
    while(!password.equals(Scanner.nextLine());
}

Granted, this is a fairly simple example but for longer pieces of code similar to this a do-while can be quite useful. Of course, you don't have to use do-while loops, it's easy enough to get around ever having to ever use do-while loops (similar to how you never need to use the ternary comparison operator).

The reason the while condition checking is at the end is because of the way you'd read it (and also because it's the way it's done in C/C++):

You'll read the "do", then it doesn't matter what the condition is the first time through. Once you reach the end, then you'd read the condition, and it's only then that you check the condition.

Na, I avoided using the for a while, too, and it's not too difficult at all to just ignore using them

I also ignore for-each loops a lot. I don't know why, but I just like having the control that using indexes gives.

Originally Posted by Charlie

Same here! But lately Ive been thinking for-each looks a lot more professional so Im trying to change. (Prolly mainly because I watched some google seminar and they almost used for-each exclusively for loops ).

That's because Google prescribes to the Python philosophy (I think it's called "Pythonic"), where you only get for-each loops Both for loop styles has it's uses in my opinion, and it's very easy to duplicate a for-loop with indices using just a while-loop.