4 replies to this topic

[Programmr]

Hi guys, I'm currently learning C#. I have a couple questions.

What are class properties and how are they used?

What are instance variables?

I've read some things about both, but can't seem to grasp the concept. Can anyone explain them and give an example or an analogy?

[chili5]

Instance variables are variables in a class that each object (instance of said class) has a copy of.

So:

class person {

      String sName;

      int nAge;


     person(String sName, int nAge) {

          this.sName = sName;

          this.nAge = nAge;

     }

}


person bob = new person("bob",16);

person joe = new person("joe",27);

I've created two instances of the person class. So I have two person objects. bob has a variable sName and a variable nAge. Then the joe object has a separate sName and nAge variables.

So if I printed them with:

System.out.println(bob.sName + " " + bob.nAge);

System.out.println(joe.sName + " " + joe.nAge);

The output would be:

Quote

bob 16
joe 27

This allows your objects to have similar properties with different values. :)

Then a class property is a variable that only one copy of the variable exists (independent of how many instances of that class there are). I can't seem to come up with an example of this though.

[Programmr]

Ok! awesome I get it. Thanks for the tips. I really appreciate it. I'm sure I'll have more questions in the future, but I'll try not to post too many haha.

[chili5]

Good! :)

No worries, if you have any questions post them! It's what CC is for. ;)

[TcM]

Wow... that's great help chili5! I repped you for that... nice seeing you around helping people :D