Java Utililty Methods String Difference

String difference(String s1, String s2)
Compare two strings, and return the portion where they differ.

int at = differenceAt(s1, s2);
if (at == -1) {
 return "";
return s2.substring(at);

int difference(String str1, String str2)
Returns the number of characters in the two Strings that are the same.

if (str1 == null || str2 == null) {
 return 0;
int lengthToMatch = Math.min(str1.length(), str2.length());
int diff = 0;
for (int i = 0; i < lengthToMatch; i++) {
 if (str1.charAt(i) == str2.charAt(i)) {
 diff++;
...

String difference(String str1, String str2)
difference

if (str1 == null) {
 return str2;
if (str2 == null) {
 return str1;
int at = indexOfDifference(str1, str2);
if (at == -1) {
...

String difference(String str1, String str2)
difference

if (str1 == null) {
 return str2;
if (str2 == null) {
 return str1;
int at = indexOfDifference(str1, str2);
if (at == -1) {
...

String difference(String str1, String str2)
difference

if (str1 == null) {
 return str2;
if (str2 == null) {
 return str1;
int at = indexOfDifference(str1, str2);
if (at == INDEX_NOT_FOUND) {
...

String difference(String str1, String str2)

Compares two Strings, and returns the portion where they differ.

if (str1 == null)
 return str2;
if (str2 == null)
 return str1;
int at = indexOfDifference(str1, str2);
if (at == -1)
 return EMPTY;
return str2.substring(at);
...

boolean difference(String string1, String string2)
difference

boolean res = false;
if (string1 != null && string2 == null) {
 res = true;
} else if (string1 == null && string2 != null) {
 res = true;
} else if (string1 != null && string2 != null) {
 if (!string1.equalsIgnoreCase(string2)) {
 res = true;
...

String difference(String xpath1, String xpath2)
difference

String[] paths1 = split(xpath1);
String[] paths2 = split(xpath2);
int length = Math.min(paths1.length, paths2.length);
int index = 0;
while (index < length && paths1[index].equals(paths2[index])) {
 index++;
StringBuffer b = new StringBuffer();
...

int differenceAt(String s1, String s2)
Compare two strings, and return the index at which the strings begin to differ.

int i;
for (i = 0; (i < s1.length()) && (i < s2.length()); ++i) {
 if (s1.charAt(i) != s2.charAt(i)) {
 break;
if ((i < s2.length()) || (i < s1.length())) {
 return i;
...

int differenceEncoded(String es1, String es2)
Returns the number of characters in the two Soundex encoded Strings that are the same.

if (es1 == null || es2 == null) {
 return 0;
int lengthToMatch = Math.min(es1.length(), es2.length());
int diff = 0;
for (int i = 0; i < lengthToMatch; i++) {
 if (es1.charAt(i) == es2.charAt(i)) {
 diff++;
...