Understanding Upcasting and Downcasting

Question

Hello! I would like to start of with I am a beginner in Java and I am having trouble understanding how Class related casting works. Using the example from the Up/Down-casting module, I do not understand where the casting is implemented and how it changes what 'could be' the initial script. I have added comments on what I understand and what i need clarification on, thanks in advance!

// What is the output of this code?
class A {
public void print() {
//
System.out.println("A");
}
}
class B extends A {
//cast B onto A method which is print()
public void print() {
//print() prints Letter B when B is upcast onto A? needs help
System.out.println("B");
}
public static void main(String[ ] args) {
A object = new B();
//how does the first 'B' affect the code here?
//what would make this code print A instead of B?
B b = (B) object;
b.print();
}
}

Answer 1

http://www.codejava.net/java-core/the-java-language/what-is-upcasting-and-downcasting-in-java