JAVA--先頭と末尾の指定文字を削除

//         
    public String trimFirstAndLastChar(String source,char element){

        boolean beginIndexFlag = true;

        boolean endIndexFlag = true;

        do{

            int beginIndex = source.indexOf(element) == 0 ? 1 : 0;

            int endIndex = source.lastIndexOf(element) + 1 == source.length() ? source.lastIndexOf(element) : source.length();

            source = source.substring(beginIndex, endIndex);

            beginIndexFlag = (source.indexOf(element) == 0);

            endIndexFlag = (source.lastIndexOf(element) + 1 == source.length());

        } while (beginIndexFlag || endIndexFlag);

        return source;

    }