首字母大写、驼峰名字转换

将a_boy 转换为 ABoy

public static String firstLetterUpper(String str){
    char[] ch = str.toCharArray();
    if (ch[0] >= 'a' && ch[0] <= 'z') {
        ch[0] = (char)(ch[0] - 32);
    }
    return new String(ch);
}

/**
 * org.apche.commons.lang.StringUtils
 * 将a_boy 转换为 ABoy
 * @param str
 * @return
 */
public static String firstUpperCamelCase(String str){
    if (StringUtils.isNotBlank(str)) {
        str = str.toLowerCase();
        String[] strs = str.split("_");
        if (strs.length == 1) {
            return firstLetterUpper(str);
        }else {
            String convertedStr = "";
            for (int i = 0; i < strs.length; i++) {
                convertedStr += firstLetterUpper(strs[i]);
            }
            return convertedStr;
        }
    }
}