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Continuing Advice requested

Posted on 2004-10-02
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Last Modified: 2010-03-31
reference: http://www.experts-exchange.com/Programming/Programming_Languages/Java/Q_21153763.html


for each method similar to insert in the mySequence class, you said i need to return a Position instance, which makes sense...but what exactly is the instance's value each time? what am I returning? and where do i grab this from?? I am quite a noob to java...but i'm sure you already figured that. sry for the questions!!! thanks so much.
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Question by:D4Ly
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11 Comments
 
LVL 92

Expert Comment

by:objects
ID: 12210034
you'll return a new instance of your myPosition class that wraps the relevent element.

ie. the elements() method of the created instance will return the appropriate Comparable instance.
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LVL 9

Author Comment

by:D4Ly
ID: 12210049
can you give me a for example for my insert()?

public Position insert(Comparable o) {
               _seq.insert(o);
               return null;
   }
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LVL 92

Accepted Solution

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objects earned 500 total points
ID: 12210056
if you were using the example implementation I posted in the previous q it would be:

public Position insert(Comparable o) {
             _seq.insert(o);
             return new myPosition(o);
   }
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LVL 9

Author Comment

by:D4Ly
ID: 12210068
thx again. you the man.
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LVL 9

Author Comment

by:D4Ly
ID: 12210072
what exactly does Positions do for me?
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LVL 92

Expert Comment

by:objects
ID: 12210099
the Position class defines the methods required by any class that implements it.
See the link I posted in your previous question for a more details explanation of interfaces (than I can give you).

also here:
http://java.sun.com/docs/books/tutorial/java/interpack/interfaces.html
0
 
LVL 9

Author Comment

by:D4Ly
ID: 12210145
nono, i understand what an interface does...i am just wondering how the application of using datatype Positions impacts my problem. make sense?
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LVL 92

Expert Comment

by:objects
ID: 12210187
not sure i follow, what problem are you referring to?
0
 
LVL 9

Author Comment

by:D4Ly
ID: 12212038
My problem, being the entire task i am trying to accomplish, creating a positional container out of an arrayList. I am unsure why myPositions and Positions classes are needed in order to accomplish this.  I'm just not understanding the point of needing type Position conceptually.
=============================================
Can you help with this one?

public Comparable remove(Position p) {
            _seq.remove(p);
            return new myPosition(p);
   }

this should be my last issue with this problem. Here's what I know. Position p is the slot in the arrayList containing the data I want to remove. My remove method is expecting an int, not a Position.

Do I typecast p to an int value? Is there a different way to approach this? I know I can't call _arr[p] to access my _arr array's value at p when p is of type Position. I also know that typcasting from type Position to type Integer to type Int does not work, or at least i can't figure out how to.  So, after I've figured out how to remove the value from the array in position p, I want to return the value of _arr[p], and i know my remove() method returns type Object. But how do I return type Object as type Position? Thanks again
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LVL 9

Author Comment

by:D4Ly
ID: 12212064
I'll put it in a new q for pts.
0
 
LVL 92

Expert Comment

by:objects
ID: 12213895
>  I am unsure why myPositions and Positions classes are needed in order to accomplish this.

I'm not sure either actually as I hinted on earlier. The Position just seems to be a thin wrapper around the Comparable instance.
Perhaps ask your lecturer.
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