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Normally, I've seen Inner Classes used for things like implementing an
Iterator for a collection, an event handler, or perhaps some default
strategies for a class.  I've personally also used them for implementing a
Runnable that maintains a class (a monitor thread, or cleaner process,
etc).

You can get yourself into some trouble using inner classes, since they have
access to everything in the enclosing class at runtime.  This can promote
bad programming practice.  However, being able to defining Event handlers
in right inside the GUI classes that needs them is very nice.

Here's a link to an entry on the Sun Java forum about the exact issue you
are referring to:
http://forum.java.sun.com/thread.jsp?thread=535839&forum=31&message=2589679

Just my 2 cents.

Chris DeLashmutt
Senior R&D Analyst
LeasePlan USA
1165 Sanctuary Pkwy., Alpharetta, GA 30004
Phone: 678-202-8695
Fax: 678-921-4895
ClearCase problems? Check out the LeasePlan ClearCase FAQ for answers!


                                                                                
                                                        
                      "Bartell, Aaron L.                                        
                                                        
                      (TC)"                      To:       "Java Programming on 
and around the iSeries / AS400"                         
                      <ALBartell@taylorco         <java400-l@xxxxxxxxxxxx>      
                                                        
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                      Sent by:                   Subject:  public classes 
within public classes                                         
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                      11/15/2004 02:00 PM                                       
                                                        
                      Please respond to                                         
                                                        
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Hi all,

I just came across some code that has embedded classes within classes
and was surprised because I didn't know that was a feature of the
language (guess I have been doing Java longer than I thought - since
1.1).

Example

Public class MyClass {

 // methods and such

  public class MyInnerClass {
   // methods and such
  }


}

Anyway, what I am wondering is if there are any huge drawbacks to going
this route.  I came across it in the code that the Web Interaction
Wizard in WDSc created for me.  In this specific scenario it seems to be
a good fit because the outer class defines an RPG program to call, and
the inner classes define the input and output data structures that are
passed.

Thoughts?
Aaron Bartell

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