How to open a file in any directory not only in current DIR

hi
i am new to java .
i have written the code for opening a file and reading the opened file.
i used filedialog to select a file for opening.
problem is it is opening a file only in the cuurent working directory.
i.e FileDialog.getFile() only returning the file name .what should i do to get the entire path of the file so that i can open a file any where in my System.

plz give replies
fileDialog.getDirectory() + fileDialog.getFile()

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How to open a file in any directory not only in current DIR

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