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

StringcamelCaseToUnderscores(String camel)
camel Case To Underscores 
String underscore;
underscore = String.valueOf(Character.toLowerCase(camel.charAt(0)));
for (int i = 1; i < camel.length(); i++) {
    underscore += Character.isLowerCase(camel.charAt(i)) ? String.valueOf(camel.charAt(i))
            : "_" + String.valueOf(Character.toLowerCase(camel.charAt(i)));
return underscore;
StringcamelCaseToUnderScoreUpperCase(String camelCase)
Convert a camel case string to underscored capitalized string. 
String result = "";
boolean prevUpperCase = false;
for (int i = 0; i < camelCase.length(); i++) {
    char c = camelCase.charAt(i);
    if (!Character.isLetter(c))
        return camelCase;
    if (Character.isUpperCase(c)) {
        if (prevUpperCase)
...
StringcamelToUnder(String value)
convierte el string value de formato camelcase to underscore 
String regex = "([a-z])([A-Z])";
String replacement = "$1_$2";
return value.replaceAll(regex, replacement).toLowerCase();
StringcamelToUnderline(String param)
camel To Underline 
if (param == null || param.length() == 0) {
    return param;
int len = param.length();
StringBuilder sb = new StringBuilder(len);
for (int i = 0; i < len; i++) {
    char c = param.charAt(i);
    if (Character.isUpperCase(c)) {
...
StringcamelToUnderlinedName(String name)
camel To Underlined Name 
StringBuilder sb = new StringBuilder();
boolean lastWasUnderline = false;
for (int i = 0; i < name.length(); i++) {
    char c = name.charAt(i);
    boolean isCaps = Character.isUpperCase(c);
    if (isCaps) {
        if (i > 0 && !lastWasUnderline) {
            sb.append('_');
...
StringcamelToUnderLineString(String str)
null => "" " " => "" "abc" => "abc" "aBc" => "a_bc" "helloWord" => "hello_word" "hi hao are you" => "hi hao are you" "helloWord_iAmHsl" => "hello_word_i_am_hsl" 
return camelToFixedString(str, "_");
StringcamelToUnderscore(String value)
Convert a string from camel case to underscores, also replacing periods with underscores (so for example a fully qualified Java class name gets underscores everywhere). 
String result = value.replace(" ", "_");
result = result.replaceAll("([a-z])([A-Z])", "$1_$2");
result = result.replace(".", "_");
result = result.toLowerCase();
return result;