关于next和nextLine

next

对于一段输入，截取遇到的第一个word，从第一个非空白字符读起，到遇见空白字符结束。
结束时遇到的空白字符不会读取，留在缓冲区中。

Finds and returns the next complete token from this scanner.
A complete token is preceded and followed by input that matches the delimiter pattern.

This method may block while waiting for input to scan, even if a previous invocation of hasNext() returned true.
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nextLine

读取当前行所有内容，包括出现的空白，制表符，直到遇到换行
最后的换行不会读取，但会从缓冲区中丢弃

Advances this scanner past the current line and returns the input that was skipped.

This method returns the rest of the current line, excluding any line separator at the end.
The position is set to the beginning of the next line.

Since this method continues to search through the input looking for a line separator, it may buffer
all of the input searching for the line to skip if no line separators are present.
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hasNext()和hasNextLine()

hasNext()//输入空白,制表,换行时,还会一直等待输入,直到输入有效字符才返回true
hasNextLine()//输入的有换行符,就会返回true,没有就一直阻塞等待
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