I need to use windows file path to do some operation on files but i am getting invalid escape sequence error.
File f = new File("C:\test");
the system accepts only " \\\\ " or "/" but if I copy file path from windows it is with "\\". how can i solve this issue
Use File.seperator in place of "\\".
File f = new File("C:"+File.seperator+"test");
File.seperator returns "\\" and it is not treated as an escape character.
If your file test.txt
is saved in folder D:/MyFloder/MyPrograms you can do something like this
File f = new File("D:"+File.seperator+"MyFloder"+File.seperator+"MyPrograms"+File.seperator+"test.txt");
EDIT
You don't need to worry about OS
For Unix : File.separator = /
For Windows : File.separator = \\
\\
is the escape character in Java Strings. Use \\\\
instead.
"C:\\\\test"
resolves to the String C:\\test
You can use \\\\
or /
but /
is better because it is OS-independent.
Replace the single backslash in the path with a double backslash or a single forward slash to solve your issue.
Internally, Java will convert it to the file seperator of the OS
File f = new File("C:\\\\test");
is correct.
You are not creating a File with the path "C:\\\\test" here. You are creating a File with the path "C:\\test". The \\\\-to-\\ conversion happens when you compile the program - by the time your program is running, the double backslashes are gone.
The same for String - String s = "C:\\\\test";
does not create a string with two backslashes, only one.
You can think of it this way: the string does not actually have two backslashes, but you have to write it that way to put it in your code.
You might be wondering why that is - it's because backslashes are used to insert special characters in strings. When you type \\t
in a string it inserts a tab, for example. If you want to insert a backslash, then t, you type \\\\t
.
您可以在Windows XP以后的路径中使用'/'(与Linux中一样),因此请忽略\\
Use java.nio.file.Path
instead of java.io
, you'll not have problem with escape sequence character :
import java.nio.file.Path;
import java.nio.file.Paths;
Path path = Paths.get("C:\test");
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