Coding in Bluej
 

i dont know what it is but im snagged on this problem:

Exercise 2.48: add a further field, refnumber to the book class. this field can store a reference number for a library, for example. it should be a type string and initialized to the zero length string ("") in the constructor as its initial value is not passed in a parameter to the constructor. instead, define a mutator for it with the following signature:

public void setRefNumber (String ref)

the body of this method should assign the value of the paramter to the refNumber field. Add a corresponding getRefNumber accessor to help you check that the mutator works correctly.

I speak for everyone. oOo:

BlueJ the java program?

I wish i remembered the program i used for java.
However, i can't help ya i haven't done java in like 2 years.

yeah, we just started it in class today. im trying to figure out what theyre asking of me.

Ill be learning java in two weeks...

From what i read it would look something like this in C++ but i'm still clueless on what exactly is meant by mutator.



public void setRefNumber (String ref)
{
refNumber = "'
}

void int()
{
setRefNumber(String refNumber)
}

mutator methods change values. when i learned it methods didnt have those gay names ... not sure why they are necessary.

getSomething() <- access

setSomething() <- mutate

so all its asking you to do is to redefine that method so that you can set refnumber to whatever you want ( a string in this case ) in other methods , classes, and the main method.

not sure what all the variables are in the class but

public void setRefNumber (String ref)
{
refnumber = ref;
}

public String getRefNumber()
{
return refNumber;
}

i cheated and had to look up mutate and access ... this might be helpful :


http://www.thiruvathukal.com/luc/cs170/lectures/02.pdf

thanks [img]http://www.affichescinema.com/insc_t/tommy_boy.jpg[/img]

:|

That movie is an absolute classic.

"The point is, how do you know the Guarantee Fairy isn't a crazy glue sniffer? "Building model airplanes" says the little fairy, but we're not buying it. Next thing you know, there's money missing off the dresser and your daughter's knocked up, I seen it a hundred times."