在Java中，将字符串用作文件路径名时，“ \\\\”和“ \\”有什么区别

Question

Eg When I use C:\\\\a.txt

It works fine, but when I use C:\\a.txt

It does not.

Anyone explain the difference between the two except from saying one works and the other doesn't.

Thanks

Answer 1

\\ is a special character used for escaping other special characters. As such, if a single \\ is present it is interpreted as a special character in the string, but since there is nothing to escape, it's considered a "wrong usage".

Therefore, the \\ has to be escaped with a second \\ to give it its literal meaning.

Answer 2

A single \\ means an escape sequence which has a specific meaning for the compiler. \\\\ basicly escapes the escape sequence. So, if you type C:\\a the compiler treats \\a as a escape sequence, something that you did not intend.

http://docs.oracle.com/javase/tutorial/java/data/characters.html

Answer 3

In java the \\ symbol is reserved to use with other char to make special symbols, for example,

\n is new line
\t is a tab

So if you use one \\ like in C:\\a.txt it will think that \\a is an special char, while using \\\\ will be transformed in one \\

Answer 4

只是要记住的一句话： Backslash is NOT a path separator!

Answer 5

它也很好用File.separator来获得运行JVM的操作系统所必需的分隔符“ /”或“ \\”（如果还有其他分隔符，我不知道它们）。