Looping a string an int number of times and reducing it

Question

If I enter the string str and int n, I need to create a loop that will print the beginning of the line n times, with the first n characters, then the first n - 1, then n - 2, and so on, until it prints only the first character.

So, for example, "Apples" and "3" will lead to "AppApA".

I created the following that works ... several. "n" is an int.

int i = 0;
while(i <= n)
{
    System.out.println(str.substring(0, Math.min(str.length(), n)));
    n = n - 1;
    i++;
}

This works for ints <= 2; if I enter a string like "Chocolate" and int 3, I get "ChoCh" when I get "ChoChC".

It made me startle for about 30 minutes. Any insight appreciated.

Answer 1

i. , 1, :

while (n > 0)
{
    System.out.println(str.substring(0, Math.min(str.length(), n)));
    n = n - 1; // n-- would do the same thing here
}

Answer 2

i n, n/2 . , n, .