Concatenate a path and a Filename (different Filesystems)

Question

Hi,
i've got the following problem:
I have 2 Strings. One contains an absolute Path to a Folder (not a File!), the other one contains a File Name. Now I want to concatenate this 2 Strings to an absolute Path to this File. Problem is:
Example:
String1 contains c:\
String2 contains blah.txt
Concatenation is: c:\blah.txt
This is ok.
Example 2:
String 1 contains c:\test
(Note the missing backslash)
String2 contains blah.txt
Concatenation is: c:\testblah.txt
This is INCORRECT.
The simple solution is to test whether there is a backslash at the end of the string or not.
But here i've got the problem with other file Systems. If the String is /homes/blah and I put a backslash at the end I'll run into trouble ;)
Is there a smart way to solve this or do I have to test every alternative?
Thanks in advance for answers!
Yours,
Sebastian

Answer 1

You can always append "/" after the folder name even if there's already a slash- or backslash at the end (and if the file really exists, of course), no matter what OS.
String folderA = "C:\\Temp";
String folderB = "C:\\Temp\\";
String folderC = "C:/Temp/";
String file = "test.txt";
System.out.println(new File(folderA+"/"+file).exists());
System.out.println(new File(folderB+"/"+file).exists());
System.out.println(new File(folderC+"/"+file).exists());All should return true if C:\Temp\test.txt is present.