Java Utililty Methods String Camel Case to Underscore

List of utility methods to do String Camel Case to Underscore

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Description

The list of methods to do String Camel Case to Underscore are organized into topic(s).

Method

StringcamelCase2UnderScoreCase(String str)
camel Case Under Score Case 
StringBuilder sb = new StringBuilder();
char[] chars = str.toCharArray();
for (int i = 0; i < chars.length; i++) {
    char c = chars[i];
    if (Character.isUpperCase(c)) {
        sb.append("_").append(Character.toLowerCase(c));
    } else {
        sb.append(c);
...
StringcamelCase2UnderscoreLowercase(String name)
camel Case Underscore Lowercase 
return camelCase2Underscore(name).toLowerCase().replace('-', '_');
StringcamelCaseToLowerCaseUnderline(String name)
camel Case To Lower Case Underline 
StringBuilder newName = new StringBuilder();
for (int i = 0; i < name.length(); i++)
    if (Character.isUpperCase(name.charAt(i))) {
        if (i == 0)
            newName.append(Character.toLowerCase(name.charAt(i)));
        else
            newName.append("_").append(Character.toLowerCase(name.charAt(i)));
    } else
...
StringcamelCaseToUnderline(String name)
camel Case To Underline 
final int length = name.length();
boolean inupper = false;
StringBuilder stb = new StringBuilder(length);
int i = 0;
while (i < length) {
    char c = name.charAt(i);
    i = i + 1;
    if (inupper) {
...
StringcamelCaseToUnderscore(final String camelCaseString)
Convert aStringUnderscored into A_STRING_UNDESCORED. 
StringBuilder sb = new StringBuilder();
for (String camelPart : camelCaseString.split("(?<!(^|[A-Z]))(?=[A-Z])|(?<!^)(?=[A-Z][a-z])")) {
    if (sb.length() > 0) {
        sb.append("_");
    sb.append(camelPart.toUpperCase());
return sb.toString();
...
StringcamelCaseToUnderscore(final String str)
camel Case To Underscore 
final StringBuilder sb = new StringBuilder();
for (int i = 0; i < str.length(); i++) {
    char c = str.charAt(i);
    if (Character.isUpperCase(c)) {
        if (i != 0) {
            sb.append("_");
        sb.append(Character.toLowerCase(c));
...
StringcamelCaseToUnderscore(String camelCase)
Turns CamelCased string into Underscored one 
StringBuilder builder = new StringBuilder();
char[] chars = camelCase.toCharArray();
for (int j = 0; j < chars.length; j++) {
    if (Character.isUpperCase(chars[j])) {
        if (j != 0) {
            builder.append('_');
        builder.append(Character.toLowerCase(chars[j]));
...
StringcamelCaseToUnderscore(String camelCased)
camel Case To Underscore 
final String regex = "([a-z])([A-Z]+)";
final String replacement = "$1_$2";
return camelCased.replaceAll(regex, replacement);
StringcamelCaseToUnderScore(String key)
camel Case To Under Score 
if (key.isEmpty())
    return key;
StringBuilder sb = new StringBuilder(key.length());
for (int i = 0; i < key.length(); i++) {
    char c = key.charAt(i);
    if (Character.isUpperCase(c))
        sb.append("_").append(Character.toLowerCase(c));
    else
...
StringcamelCaseToUnderscored(String camelCaseName)
A deliberately very inflexible camel case to underscored converter; it must not convert improper camel case names to a proper underscored name. 
int i = 0;
while (i < camelCaseName.length() && Character.isLowerCase(camelCaseName.charAt(i))) {
    i++;
if (i == camelCaseName.length()) {
    return camelCaseName;
StringBuffer sb = new StringBuffer();
...