Java Substring Comparisons Hackerrank Solution

 Java Substring Comparisons Hackerrank Solution

For Explanation Watch Video:

Sample Input 0

welcometojava
3

Sample Output 0

ava
wel

Code:

import java.util.Scanner;
public class Solution {
    public static String getSmallestAndLargest(String s, int k) {
        String smallest = "";
        String largest = "";
        smallest = s.substring(0,k);
        largest = s.substring(0,k);
        for(int i=0;i<=s.length()-k;i++){
            String sub = s.substring(i,i+k);
            if(smallest.compareTo(sub)>0){
                smallest = sub;
            }
            if(largest.compareTo(sub)<0){
                largest = sub;
            }
        }
        return smallest + "\n" +largest;
    }

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String s = scan.next();
        int k = scan.nextInt();
        scan.close();
      
        System.out.println(getSmallestAndLargest(s, k));
    }
}