By the way COPYING objects as arguments in question Setters.

Hey everyone, I'm having a terribly confusing problem with my assignment for school. I'll try to expose the problem simply.

I create a class named CourseGrades.

Here is the code
public class CourseGrades {
     
     private GradedActivity grades0;
     private GradedActivity grades1;
     private GradedActivity grades2;
     private GradedActivity grades3;
     
     
     public void setLab(GradedActivity g)
     {
          this.grades0 = g;
     }
//etc
My setLab is not correct read first of all, I want to elaborate on the issue.

This is what the teacher asks explicitly in the assignment for the set accessors:
Book Instruction: each set accessor must have the corresponding object passed as an argument and linked to the corresponding grades field.
• Teacher additional Note: when you pass an object to one of the necessary methods (setLab(), setPassFailExam(), etc.) the object is supposed to be assigned to a variable of an appropriate instance of type GradedActivity. Make sure that you assign a 'complete' correct copy of the passed object and not only a reference to the object passed original. (that is to say each class needs a correct copy constructor (not the copy method). >)

Until I read this my initial setter was good
After reading this, I went to my GradedActivity class (you see the name in my first Set accessor code).

I have created a complete copy as follows
     public GradedActivity(GradedActivity g)
     {
          score = g.getScore();
     }
* the score being a private double field declared at the top of the GradedActivity class.

Now back to my setLab method; I have no idea how to pass the object to copy as an argument now. With my consctrutor copy I do not enter what argument would pass the COPY of this specific object in my setter. So it is where I am so far, trying to figure how to write my setter for the copy of the object as an argument.

Thanks in advance.

Basshunter36 wrote:
>
Tip: you call constructors (any type of constructors) with the new keyword.

>

     public void setLab(GradedActivity g)
     {
          this.grades0 = new GradedActivity;
     }

Go back and look at my example in the first answer here.

Would that be? I can't understand what it tho so this is it, no new creates a new object?

Yes, it does, which is exactly the point. When you call setLab (g), you want the Set accessor to create a new GA object that is a copy of the original - that is, all its fields have the same values as their counterparts in the original - a you want to set the grades0 of the object field to point to the newly created copy.

I'm just trying to pass the argument and do the grades0 of field field values of the copy.

Exactly. Thus, the setter creates the new object and points gades0 to it. The copy is the new object and it is created by the Set accessor method.

Edited by: jverd may 2, 2011 14:32

Tags: Java

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