Re: inner class scope issues

From:

Lew <lew@lewscanon.com>

Newsgroups:

comp.lang.java.programmer

Date:

Wed, 25 Mar 2009 08:20:49 -0700 (PDT)

Message-ID:

<693b1791-9ca9-4201-be79-f5aad44f2cff@w34g2000yqm.googlegroups.com>

On Mar 25, 11:17 am, "Mike Schilling" <mscottschill...@hotmail.com>
wrote:

Lew wrote:

If it doesn't declare a method, the only way to have it is by
inheritance.

Incorrect.

Here's another semi-obscure case (not compiled, so forgive any typos)

    interface Persistent
    {
            Persistent read(InputStream strm);
            void write(OutputStream strm);
    }

    abstract class DocumentBase implements Persistent
    {
        protected void writeToFile(String fname) throws IOExcepti=

{
FileOutputStream fos = new FileOutputStream(fna=

me);

            try
            {
                write(fos);
            }
            finally
            {
                fos.close();
            }
    }

Observe that DocumentBase has the abstract methods read and write just
as if it had explicitly declared them or inherited them from a
superclass. Obviously, it "inherited" them from the interface, but
that's not usually how we use that word.

Yes, it is actually. It is precisely how we use that word.

--
Lew