LargestFiveDigit.java

package main.java.kyu7;

/**
 * 7 kyu - Largest 5 digit number in a series
 *
 * https://www.codewars.com/kata/51675d17e0c1bed195000001
 *
 * Details:
 *
 * In the following 6 digit number:
 *
 * 283910
 *
 * 91 is the greatest sequence of 2 consecutive digits.
 *
 * In the following 10 digit number:
 *
 * 1234567890
 *
 * 67890 is the greatest sequence of 5 consecutive digits.
 *
 * Complete the solution so that it returns the greatest sequence of five consecutive digits found
 * within the number given. The number will be passed in as a string of only digits. It should
 * return a five digit integer. The number passed may be as large as 1000 digits.
 */

public class LargestFiveDigit {
    public static int solve(final String digits) {
        int result = 0;

        for (int i = 0; i < digits.length() - 4; i++) {
            final int compare = Integer.parseInt(digits.substring(i, i+5));
            result = Math.max(result, compare);
        }

        return result;
    }
}