String(1) : 驼峰与下划线拼接格式转换

    public static void main(String[] args) {
        String str = "xin_yang_sheng_guang_ba";
        System.err.println(str);
        System.err.println(xiaHuaXianToTuoFeng(str));
        System.err.println(tuoFengToxiaHuaXian(xiaHuaXianToTuoFeng(str)));

    }

    /**
     * 驼峰转下划线
     *
     * @param str
     * @return
     */
    public static String tuoFengToxiaHuaXian(String str) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < str.length(); i++) {
            if (Character.isUpperCase(str.charAt(i))) {
                sb.append("_").append(Character.toLowerCase(str.charAt(i)));
            } else {
                sb.append(str.charAt(i));
            }
        }
        return sb.toString();
    }

    /**
     * 下划线转驼峰
     *
     * @param str
     * @return
     */
    public static String xiaHuaXianToTuoFeng(String str) {
        String[] strings = str.split("_");
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < strings.length; i++) {
            if (i == 0) {
                sb.append(strings[i]);
            } else {
                sb.append(strings[i].substring(0, 1).toUpperCase() + strings[i].substring(1));
            }
        }
        return sb.toString();
    }

 

 

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