Engine.java

package RepeatedSubString;

import java.util.Scanner;

public class Engine {

    public static boolean start() {
        while (true) {
            Scanner sc = new Scanner(System.in);
            System.out.print("String: ");
            String input = sc.nextLine();
            int stringSize = input.length();
            int subParts = 1;

            for (int i = 2; i <= stringSize / 2; i++) {
                if (stringSize % i == 0) {
                    boolean result = subChecker(input, i);
                    if (result) {
                        subParts = i;
                        break;
                    }
                }
            }

            System.out.println("res -> " + subParts + "\n");
        }
    }

    public static boolean subChecker(String input, int subParts) {
        int stringSize = input.length();
        Verifier verifier = new Verifier();
        int stripSize = stringSize / subParts;
        int lastSubIndex = 0;
        boolean result = false;

        for (int j = 0; j < subParts; j++) {
            String subString = input.substring(lastSubIndex, lastSubIndex + stripSize);
            result = verifier.checkString(subString);
            if (!result) break;
            lastSubIndex += stripSize;
        }

        return result;
    }

    public static void main(String[] args) {
        start();
    }
}


class Verifier {

    private String StoredString;

    public boolean checkString(String aString) {
        if (StoredString != null) {
            return StoredString.equals(aString);
        } else {
            StoredString = aString;
            return true;
        }
    }
}