[java] Java OO question..

Pass Obj A to the Obj C's constructor?

If I understand correctly, this is the situation:

class A{}class B{  private C c;  B()  {    c = new C();  }}class C{}

Quote:

Now how do I make Obj C access the Vars and Methods of Obj A?

Do you mean
a) C should inherit A and use it methods?
b) C should be able to refer to an instance of A and call it methods?

Yes, your object of class C requires an object of type A, which must be given to it by B during its creation.

So B requires an object of class A during its creation.

Quote:

Original post by ToohrVyk Yes, your object of class C requires an object of type A, which must be given to it by B during its creation. So B requires an object of class A during its creation.

I tried this but my applet wouldn't instanciate (Obj B) when I passed the object to the constructor..

Quote:

public void foo( ) { c.foo( ); }

Noob question, what does this code do? (I think this is where I went wrong)

This is a member function of B. It says that when calling b.foo( ), it will call b.c.foo( ).

Quote:

Original post by ToohrVyk This is a member function of B. It says that when calling b.foo( ), it will call b.c.foo( ).

Yeah but what does calling b.c.foo() or b.foo() actually do?

Getter and Setter?

class A {  private int value;  A (int a) {    value = a;  }    public int getAValue() { return a; }}class B {  B(A a) {    new C(a);  }}class C {  C(A a) {    System.out.println("Value of \"a\": " + a.getAValue());  }}

Ugly code, but you may understand what I mean =P

Quote:

Original post by Son of Cain Getter and Setter? class A { private int value; A (int a) { value = a; } public int getAValue() { return a; }}class B { B(A a) { new C(a); }}class C { C(A a) { System.out.println("Value of \"a\": " + a.getAValue()); }} Ugly code, but you may understand what I mean =P

Yeah I think I tried something similar to this but it didn't work for some reason..

Ok let me try to elaborate on my problem:

I'm using Java3D to create a 3D scene in an applet,

My primiary class which extends applet and creates the scene graph is called Final3D..

The problem is Final3D creates Rotator3D and Animator3D Obj's and the Rotator3D Obj is fine..

But the Animator3D Obj must access the methods and data of the dData3D Obj (which is created in the main() method before the Final3D Obj is instanciated)..

Now I tried to pass the dData Obj to the constructor of the Final3D Obj (so it could then be passed to the Aniamtor3D Obj when it is created) but it won't let me do this.. Does this have something to do with the fact that the Final3D Obj extends applet or am I having different problems?

(Sorry another noob Q but i'm rusty..: Also whats a static method and var? and how/when would they be used typically?)

Post some code, it will be easier to help out. =D

If I remember correctly, a static method is one that doesn't have to be called by an instance of a class. I don't know the textbook answer, but its like the following:

public class ActiveObjectFactory {    public static final ActiveObject load(String path) {}}// Somewhere...ActiveObject aobj = ActiveObjectFactory.load("resources/xml/MyData.xml");

Static context can't access non-static variables. You need to declare these variables static as well, in order to use them in static contexts (i.e. method).