Remove filename extension in Java

Question

(Without including any external libraries.)

What\'s the most efficient way to remove the extension of a filename in Java, without assuming anything of the f

Answer 1

The remove() function above should be rewritten to support test cases like LOST.DIR/myfile.txt

    public static String removeExtension( String in )
{
    int p = in.lastIndexOf(".");
    if ( p < 0 )
        return in;

    int d = in.lastIndexOf( File.separator );

    if ( d < 0 && p == 0 )
        return in;

    if ( d >= 0 && d > p )
        return in;

    return in.substring( 0, p );
}