Java String Uncapitalize uncapitalize(String str)

Description

Uncapitalize a String , changing the first letter to lower case as per Character#toLowerCase(char) .

License

Apache License

Parameter

Parameter	Description
str	the String to uncapitalize, may be null

Return

the uncapitalized String , or null if the supplied string is null

Declaration

public static String uncapitalize(String str) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

public class Main {
    /**/*from   w  w  w .j a  va2  s  .c  o m*/
     * Uncapitalize a {@code String}, changing the first letter to lower case as per {@link Character#toLowerCase(char)}. No other letters are changed.
     * 
     * @param str the {@code String} to uncapitalize, may be {@code null}
     * @return the uncapitalized {@code String}, or {@code null} if the supplied string is {@code null}
     */
    public static String uncapitalize(String str) {
        return changeFirstCharacterCase(str, false);
    }

    private static String changeFirstCharacterCase(String str, boolean capitalize) {
        if (str == null || str.length() == 0) {
            return str;
        } else {
            char baseChar = str.charAt(0);
            char updatedChar;
            if (capitalize) {
                updatedChar = Character.toUpperCase(baseChar);
            } else {
                updatedChar = Character.toLowerCase(baseChar);
            }
            if (baseChar == updatedChar) {
                return str;
            }
            char[] chars = str.toCharArray();
            chars[0] = updatedChar;
            return new String(chars, 0, chars.length);
        }
    }
}

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