Change file extension?

Question

What the best way is change file extension of Java?

Answer 1

First You should get familiar with What file extension is.

Next correct Your question, do You want only change it or how to change it.

If You only want to change it, the we can assume that the extension i really there.

But for answer how to change extension. The answer should provide information about finding one, parsing properly the string etc...

And you should also define what the best mean for You.

For me best solution would be.

1 - Retrieve the characters after after last index of '.'.

2 - Verify that string if any in defined extensions by system.

3 - If found remove it,

4 - Add to file name new extension.

Answer 2

Just rename it using File.renameTo(String name):

 public static void main(String[] argv) throws IOException {

// Construct the file object from existing file.
File f = new File("myfile.toto"); 

// Rename it
f.renameTo(new File("myfile.myext"));

}