what does "do" do here? (java)

Question

I saw this bit of code on the interents somewhere. I'm wondering what the do is for.

public class LoopControl {
    public static void main(String[] args) {
        int count = 0;

        do {
            if (count % 2 == 0) {
                for (int j = 0; j < count; j++) {
                    System.out.print(j+1);

                    if (j < count-1) {
                        System.out.print(", ");
                    }
                }

                System.out.println();
            }

            count++;
        }
        while (count <= 5);
    }
}

By which I mean what exactly does do mean? What's its function? Any other information would be useful, too.

Answer 1

It is a do-while loop. So it will do everything in the following block while count is less than or equal to 5. The difference between this and a normal while loop is that the condition is evaluated at the end of the loop not the start. So the loop is guarenteed to execute at least once.

Sun tutorial on while and do-while.

Oh, and in this case it will print:

1, 2
1, 2, 3, 4

Edit: just so you know there will also be a new line at the start, but the formatting doesn't seem to let me show that.