Added 13 solutions

Java/Strings/Java Substring/Solution.java

@@ -5,15 +5,13 @@
 import java.util.Scanner;
 
 public class Solution {
-
     public static void main(String[] args) {
-        /* Read input */
         Scanner scan = new Scanner(System.in);
-        String s  = scan.next();
-        int start = scan.nextInt();
-        int end   = scan.nextInt();
+        String str = scan.next();
+        int start  = scan.nextInt();
+        int end    = scan.nextInt();
         scan.close();
         
-        System.out.println(s.substring(start, end));
+        System.out.println(str.substring(start, end));
     }
 }