java遞歸查找類中的字段（私有和父類中的字段）

/**
 * 獲取對象中的字段
 * @param obj which object you want to find filed
 * @param fieldName the field name you want to find
 * @return the field you want to  find
 * @throws Throwable
 * @throws NoSuchFieldException
 */
protected Field getField(Object obj,String fieldName) throws NoSuchFieldException {
    Class clzz = obj.getClass();
    Field[] fields = clzz.getDeclaredFields();
    Field dest = null;
    while (!hasField(fields,fieldName) && !clzz.getName().equalsIgnoreCase("java.lang.Object")) {
        clzz = clzz.getSuperclass();
        fields = clzz.getDeclaredFields();
    }
    if (hasField(fields,fieldName)) {
        dest = clzz.getDeclaredField(fieldName);
    } else {
        throw new NoSuchFieldException("類中沒有此字段");
    }
           
    return dest;
}
/**
 * 判斷對象中是否有要找的字段
 * @param fields the fields which you want to find
 * @param fieldName the field name you want to find
 * @return if the field in field return true else return false
 */
private boolean hasField(Field[] fields, String fieldName) {
    for (int i = 0; i < fields.length ;i ++) {
        if (fields[i].getName().equals(fieldName)) {
            return true;
        }
    }
    return false;
}