Using a string is unwieldy, and it forces you to reserve a specific number of characters in the string for each value or to use a separator character to delimit each value.
使用字符串非常笨拙，而且必须为字符串中的每个值保留固定的字符数，或者使用分隔符来划分。
2
Having two methods seems a bit wasteful. It would be nice if we could eliminate the second joiner method and declare that the separator argument in the first joiner has a default value.