Help with calling methods of different classes

Question

I have two classes. In class A I read a line of input from the console
myVar= x.readLine();
then I call a method of the same class (A)
methodA(); i get NULLPOINTEREXCEPTION here
in this method I wish to call another method but this time of class B so I create an instance of class B in class A
private B instanceVar;
and then proceed to create the method call to class B
instanceVar.methodB(myVar); i get NULLPOINTEREXCEPTION here
What am I doing wrong?

Answer 1

What am I doing wrong?Not posting a short snippet of java code that demonstrates your problem.
In class A I read a line of input from the console
myVar= x.readLine();
How is that related to the NPE's?
then I call a method of the same class (A)
methodA(); i get NULLPOINTEREXCEPTION hereSomething is probably wrong in methodA(). Impossible to say anything more with the information given.
private B instanceVar;
and then proceed to create the method call to class B
instanceVar.methodB(myVar); i get NULLPOINTEREXCEPTION hereDid you ever assign instanceVar to an actual object with something like instanceVar = new B(); ?