Error Message 'Cannot Be Resolved or Is Not a Field'
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...
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.
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.
Alexander Ross has covered the video game industry for a decade, writing deep dives on game design, esports tournaments, VR developments, and gaming culture.
