Write code to replace Last Substring
//package com.book2s; public class Main { public static void main(String[] argv) { String orig = "book2s.com"; String origSub = "o"; String newSub = "O"; System.out.println(replaceLastSubstring(orig, origSub, newSub)); }// w ww.ja va2 s .c om public static String replaceLastSubstring(String orig, String origSub, String newSub) { int first = orig.lastIndexOf(origSub); if (first == -1) { return orig; } int last = first + origSub.length(); String result = orig.substring(0, first); result = result + newSub + orig.substring(last); return result; } }