How to read/know/use relative paths in java files ?

I am able to access files in java after using the
String TxtURL = "file:///c:/files/TEXTS/";and then loop
= new File(ma.TxtURL +filename );However , I need to use this in several drives , C , D E etc , how can I use relative path ?
I used these but they didn't work
String TxtURL = "file:///TEXTS/";
String TxtURL = "file:////TEXTS/";
String TxtURL = "file:///./TEXTS/";
String TxtURL = "file:///../TEXTS/";

ya batch , I want to run a java program from batch file
java C:\...\fileand as u know that C will change , so any suggestions/solutions ?
thanks

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How to read/know/use relative paths in java files ?

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