@@ -0,0 +1,781 @@
+%0Aimport java.util.List;%0A%0Apublic class StringUtils%0A%7B%0A    private StringUtils() %7B%7D%0A%0A    /**%0A     * %E6%B7%BB%E5%8A%A0%E5%88%86%E9%9A%94%E7%AC%A6%E6%8B%BC%E6%8E%A5%E6%88%90%E5%AD%97%E7%AC%A6%E4%B8%B2%0A     * @param separator %E5%88%86%E9%9A%94%E7%AC%A6%0A     * @param list      %E5%AD%97%E7%AC%A6%E9%9B%86%E5%90%88%0A     * @return  %E5%BD%93%E5%88%86%E9%9A%94%E7%AC%A6%E4%B8%BA%22%7C%22 %E9%9B%86%E5%90%88%E6%9C%89%E4%B8%89%E4%B8%AA%E5%8F%82%E6%95%B0%5Baa,bb,cc%5D %E8%BF%94%E5%9B%9E%0A     *          %22aa%7Cbb%7Ccc%22 .%3Cp%3E%E5%A6%82%E6%9E%9C%E9%9B%86%E5%90%88%E4%B8%BA%E7%A9%BA%E8%BF%94%E5%9B%9E%E7%A9%BA%E5%AD%97%E7%AC%A6%E4%B8%B2%3C/p%3E%0A     */%0A    public static String addSeparator(String separator, List%3CString%3E list)%0A    %7B%0A        if(list == null %7C%7C list.size() == 0)%0A        %7B%0A            return %22%22;%0A        %7D%0A%0A        StringBuilder builder = new StringBuilder();%0A%0A        for (String str : list) %7B%0A            builder.append(str);%0A            builder.append(separator);%0A        %7D%0A%0A        if(builder.length() %3E 0)%0A        %7B%0A            builder = builder.delete(builder.length()-1,builder.length());%0A        %7D%0A%0A        return builder.toString();%0A    %7D%0A%7D%0A

add StringUtils