Re: Accessing super method from inner class?

From:
Knute Johnson <eternal@knutejohnson.com>
Newsgroups:
comp.lang.java.programmer
Date:
Thu, 13 Nov 2014 10:01:50 -0800
Message-ID:
<m42rm0$tr0$1@dont-email.me>
On 11/12/2014 18:54, Jeff Higgins wrote:

On 11/12/2014 08:40 PM, Knute Johnson wrote:

I've got some code where I am wrapping all the calls to
JTextArea.append() in EventQueue.invokeLater(). So I thought I would
just extend JTextArea but what I thought was obvious isn't.

import java.awt.*;
import javax.swing.*;

public class KTextArea extends JTextArea {
     public KTextArea(String text) {
         super(text);
     }

     public void append(final String str) {
         EventQueue.invokeLater(new Runnable() {
             public void run() {
                 KTextArea.this.super.append(str);


In this context, this means your new Runnable, super means Object,
and KTextArea.super means JTextArea, and KTextArea.this is undefined.

I think.


I think I've answered my own question, from the JLS;

"15.12
Method Invocation Expressions
EXPRESSIONS
500

Suppose that a field access expression T.super.f appears within class C,
and the immediate superclass of the class denoted by T is a class whose
fully qualified name is S. If f in S is accessible from C , then
T.super.f is treated as if it had been the expression this.f in the body
of class S. Otherwise, a compile-time error occurs."

I'm not sure if that is what you are saying but I think so. I thought
that the 'this' was needed to reach the instance but it appears as
though Class.super.field implies SuperClass.this.field. I'm curious how
this is going to work with static fields :-).

Thanks for taking the time to answer.

--

Knute Johnson

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