Clock test

Reversible.java

import java.util.ArrayList;

public class Reversible implements IReversible {

  
  public ArrayList<Integer> listReversible(int upperLimit) {

    ArrayList<Integer> list = new ArrayList(); 

    for(int i = 0; i < upperLimit; i++) {
      boolean found = true;
      if(i % 10 != 0) {
        if(allDigitsOdd(i + reverseNumber(i))) {
          list.add(i);
        }
      } 
    }

    return list;

  }

  public int reverseNumber(int number) {
    
    int flip = 0;

    while( number != 0 ) {
      flip = flip * 10;
      flip = flip + number%10;
      number = number/10;
    }

    return flip;

  }

  public boolean isOdd(int number) {

    if(number%2 == 0) 
      return false;
    else 
      return true;

  }

  public boolean allDigitsOdd(int number) {

    while(number > 0) {
      int digit = number % 10;
      if(!isOdd(digit))
        return false;
      number = number / 10;
    }

    return true;

  }

}