Right now I'm studying the chain of responsibility design pattern and am using Eclipse.

And I'm trying to compile this code, but I have the compiling error "isLast cannot be resolved or is not a field":

public class OverFive implements Discount { private Discount next; // public boolean isLast = false; public void setNext(Discount next, boolean Last) { this.next = next; this.next.isLast = Last; // Here is the error. } public double DoDiscount(Budget budget) { if (budget.getValue() > 500) { return budget.getValue() * 0.10; } if (this.next.isLast == false) { return next.DoDiscount(budget); } else { return 0; } }
}

And now, here is the interface:

public interface Discount { double DoDiscount(Orcamento orcamento); void setNext(Discount next, boolean Last); }

2 Answers

Here's one recommendation: study the Sun Java coding standards and take them to heart. You're breaking them too frequently in this small code sample.

Java is case sensitive: "discount" is not the same as "Discount"; "dodiscount" is not the same as "DoDiscount".

public interface Discount { double doDiscount(Orcamento orcamento); void setNext(Desconto next, boolean last); void setLast(boolean last);
} 

And the implementation:

public class OverFive implements Discount { private Desconto next; private boolean last = false; public void setLast(boolean last) { this.last = last; } public void setNext(Desconto next, boolean last) { this.next = next; this.setLast(last); } // this method is utter rubbish. it won't compile. public double doDiscount(Orcamento budget){ if (budget.getValue() > 500){ return budget.getValue() * 0.10; }if (this.next.isLast == false){ return next.discount(budget); }else{ return 0; } }
}

I think this code is more than a little confusing. No wonder you're having problems.

6

I'm not sure if this is the same type of issue as the above, but I had the same error. In my case , I was using an older version of Eclipse that apparently didn't like having a class with same name as the package. I fixed the issue by giving the package a different name.

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