Write code to find difference between two string
//package com.book2s; public class Main { public static void main(String[] argv) { String str1 = "book2s.com"; String str2 = "ook2s.com"; System.out.println(difference(str1, str2)); }/* w w w .j a v a2 s . c o m*/ public static final String EMPTY_STRING = ""; public static String difference(String str1, String str2) { if (str1 == null) { return str2; } if (str2 == null) { return str1; } int index = indexOfDifference(str1, str2); if (index == -1) { return EMPTY_STRING; } return str2.substring(index); } public static int indexOfDifference(String str1, String str2) { if ((str1 == null) || (str2 == null) || (str1.equals(str2))) { return -1; } int i; for (i = 0; (i < str1.length()) && (i < str2.length()); ++i) { if (str1.charAt(i) != str2.charAt(i)) { break; } } if ((i < str2.length()) || (i < str1.length())) { return i; } return -1; } }