Taking Values from a range of numbers where the tens n repeat

Question

I would like a way to solve a problem that consists in reading 2 user numbers that will be my start and end ex 10 and 50 and within that range do not show the repeated numbers ex 11,22,33,44.

Answer 1

You could turn this int for String and so compare your substring or still use a regular expression

Something like this:

int inicio = 0;
int fim = 50;

for (int i = inicio; i < fim; i++) {
  String check = String.valueOf(i);
  if (check.length() > 1) {
    if (check.substring(0, 1).equals(check.substring(1, 2))) {
      System.out.println(i); //mostro os repetidos
    }
  }
}