/*Given a string, return a new string where the first and last chars have been exchanged. frontBack("code") → "eodc" frontBack("a") → "a" frontBack("ab") → "ba" */ package org.stringClass; public class Pract { public static void main(String[] args) { String s = "IdeaS"; int l = s.length(); if (l > 1) { String s1 = s.substring(0, 1); String s2 = s.substring(1, (l - 1)); String s3 = s.substring((l - 1), l); System.out.println(s3 + s2 + s1); } else System.out.println(s); } }