java Cannot delete file, being used by another process

Question

I have this code

 import org.apache.commons.io.FileUtils;
    try {
        FileUtils.copyURLToFile(new URL(SHA1_LINK), new File(\"SHA1.txt\"));
        if(!         


        

Answer 1

I guess with sameSha1 you open SHA1.txt to read it and you forget to close it.

EDIT:

From your comment you contain the following line in sameSha1:

String sha1Txt = new Scanner(new File("SHA1.txt")).useDelimiter("\\Z").next();

So you create a scanner instance but you don't explicitly close it. You should do something like that:

Scanner s = new Scanner(new File("SHA1.txt"));
try {
    String sha1Txt = s.useDelimiter("\\Z").next();
    ...
    return result;
}
finally {
    s.close();
}

Or as @HuStmpHrrr suggests in Java 7:

try(Scanner s = new Scanner(new File("SHA1.txt"))) {
    String sha1Txt = s.useDelimiter("\\Z").next();
    ...
    return result;
}

Answer 2

If it's being used by another process, I'm guessing some other program has that text file open. Try closing the other program.