variable « Base class « Java Class Q&A

1. Java Base Object Multi Type Variable    stackoverflow.com

I'm sure this is incredibly common with as OOP centered as Java is. In java is there a way to make a base type variable that accepts all inherited subtypes? Like ...

2. Object oriented design with Java - casting and a derived class with more member variables than the base    stackoverflow.com

I have a base class, let's call it DispenseResult that stores the result of a machine operation. I am designing for a family of machines. DispenseResult will contain member ...

3. What happens when classes Base and Derived both have a variable 'a'?    stackoverflow.com

Consider the classes:

class Foo {
    public int a = 3;
    public void addFive() { a += 5; System.out.print("f "); }
}
class Bar extends Foo {
  ...

4. Derived variable value used rather than from base class    coderanch.com

I have been trying to figure this out and I dont seem to understand why this code outputs 8. I tried compiling it and it does give 8 but I dont know have a reason to back the answer. Can someone kindly tell me why variable "value" takes the number from the base class and not from the super class class ...

5. how to initialize base class variable without creating object for that?    java-forums.org