Java: unmark file is read-only

Question

Can I do this on Java? I'm using windows...

Answer 1

http://java.sun.com/j2se/1.6.0/docs/api/java/io/File.html#setReadOnly%28%29

File file = new File("foo.bar");
if(file.setReadOnly()) {
    System.out.println("Successful");
}
else {
    System.out.println("All aboard the fail train.");
}

Before Java6, you could not undo this. To get around this, they put in File.setWritable(boolean) which can be used as so

File file = new File("foo.bar");
if(file.setWritable(false)) {
    System.out.println("Successful");
}
else {
    System.out.println("All aboard the fail train.");
}

if(file.setWritable(true)) {
    System.out.println("Re-enabled writing");
}
else {
    System.out.println("Failed to re-enable writing on file.");
}

Answer 2

public boolean setWritable(boolean writable)

Answer 3

final File f = new File(...);
f.setWritable(true);

Will change premissions to writable (not read-only).

Note: this may not work all the times, as the underlying FileSystem may deny the request. But it works on most files on your hard drives.