分隔StringTokenizer，拼接StringJoiner，缓冲StringBuilder

[xxw1754352621]

mybatis的一段源码使用

org.apache.ibatis.logging.jdbc.BaseJdbcLogger#removeBreakingWhitespace

protected String removeBreakingWhitespace(String original) {
    StringTokenizer whitespaceStripper = new StringTokenizer(original);
    StringBuilder builder = new StringBuilder();
    while (whitespaceStripper.hasMoreTokens()) {
        builder.append(whitespaceStripper.nextToken());
        builder.append(" ");
    }
    return builder.toString();
}