Java String Camel Case To camel2underline(String hump)

Description

camelunderline

License

Open Source License

Declaration

public static String camel2underline(String hump) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

public class Main {
    private static final int alphaStep = 'a' - 'A';

    public static String camel2underline(String hump) {
        StringBuilder underline = new StringBuilder();
        char[] chars = hump.trim().toCharArray();

        for (int i = 0; i < chars.length; i++) {
            char c = chars[i];
            if (i == 0)
                underline.append(toUpperCase(c));
            else {
                if (isUpperCase(c)) {
                    underline.append('_');
                    underline.append(c);
                } else
                    underline.append(toUpperCase(c));
            }/*from w ww  .ja  va  2 s.  c  o m*/
        }

        return underline.toString();
    }

    public static char toUpperCase(char c) {
        return isLowerCase(c) ? (char) (c - alphaStep) : c;
    }

    public static boolean isUpperCase(char c) {
        return c >= 'A' && c <= 'Z';
    }

    public static boolean isLowerCase(char c) {
        return c >= 'a' && c <= 'z';
    }
}

Related

1. camel2underline(String s)
2. camelCase2Delimiter(String name, char delimiter)
3. camelCaseIt(String mappingName, String separator)
4. camelCaseMatch(String word, String abbr)