Java Utililty Methods Hash String

List of utility methods to do Hash String

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Description

The list of methods to do Hash String are organized into topic(s).

Method

longhashCode(String s)
hash Code 
long returnValue = hashCode(s, 31);
return returnValue;
StringhashCode(String sIn)
Return a hashcode as a positive Integer for a String.

In contrast to .hashCode(), this function returns a positive Integer. 

if (sIn == null) {
    return null;
return "" + Math.abs(sIn.hashCode());
inthashCode(String str)
Computes a hash code for a string. 
final char[] chars = str.toCharArray();
int h = 0;
for (int i = 0; i < chars.length; i++) {
    h = 31 * h + chars[i];
return h;
longhashCode1(String str)
hash Code 
long hash = 0;
long x = 0;
for (int i = 0; i < str.length(); i++) {
    hash = (hash << 4) + str.charAt(i);
    if ((x = hash & 0xF0000000L) != 0) {
        hash ^= (x >> 24);
        hash &= ~x;
return (hash & 0x7FFFFFFF);
longhashCode2(String str)
hash Code 
long h = 1125899906842597L; 
int len = str.length();
for (int i = 0; i < len; i++) {
    h = 31 * h + str.charAt(i);
return h;
longhashCode64(String s)
Generate a 64 bit hash code for the specified string 
long h = 0;
if (s != null && s.length() > 0) {
    int off = 0;
    int len = s.length();
    for (int i = 0; i < len; i++) {
        h = 31 * h + s.charAt(off++);
return h;
longhashCode64(String s)
64-bit variant of String#hashCode() 
long h = 1125899906842597L; 
int len = s.length();
for (int i = 0; i < len; i++) {
    h = 31 * h + s.charAt(i);
return h;
inthashCodeIgnoreCase(String a)
hash Code Ignore Case 
if (a == null)
    return 0;
return a.toLowerCase().hashCode();
inthashCodeOfStringArray(String[] stringArray)
hash Code Of String Array 
if (stringArray == null) {
    return 0;
int hashCode = 17;
for (int i = 0; i < stringArray.length; i++) {
    String value = stringArray[i];
    hashCode = hashCode * 31 + (value == null ? 0 : value.hashCode());
return hashCode;
StringhashCodeToString(byte[] hash)
Converts the given bytes to a hex String. 
StringBuffer sb = new StringBuffer("");
for (int i = 0; i < hash.length; i++)
    sb.append(Integer.toString((hash[i] & 0xff) + 0x100, 16).substring(1));
return sb.toString();