Field cannot be resolved

I have a product called superclass. ComputerPart extends product. Motherboard, RAM and disk extend ComputerPart.
I have a list called oList, which contains Product objects. The oList is divided into separate lists of ComputerPart, device, Service, cheese and fruit.
I do a method to divide still more the list of ComputerPart in an object of the motherboard, a drive object and an object of RAM.

Each object must then print their respective areas of the objects in the list.
For example, the RAM has two fields: price and type. Motherboard has two fields: price and manufacturer.

This is the code for the method that I'm having a problem with:
     public void dispatchComputerParts(){
          for(Product cp : cpList){
               if(cp instanceof Motherboard){
                    System.out.println(cp.manufacturer);
               }
Error message:
manufacturer cannot be resolved or is not a field
I think I get this error because the product is not a field called "manufacturer". How can I solve this problem?

Note: I can not add a method toString for classes of products because I am not allowed to edit them.

Published by: SquareBox on March 26, 2011 11:16

In the future, you will be better off and codes rather than describe. Provide a [url http://sscce.org] NBS.

In this particular case, however, it is fairly easy to answer.

manufacturer cannot be resolved or is not a field

I think I get this error because the product is not a field called "manufacturer". How can I solve this problem?

You could perform a cast to the appropriate type that does have this field, but that should be avoided if possible. Once again, without the full picture, it is difficult to suggest what artificial solution is appropriate to this problem with its artificial constraints.

Note: I can not add a method toString for classes of products because I am not allowed to edit them.

toString() has nothing to do with this anyway, and the substitution would not a candidate solution even if you could.

Tags: Java

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    > "

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