Trying to understand upcasting in Java. Recently observed strange behavior.
Example:
public class A extends B {
public int i = 2;
public void printI() {
System.out.println("print i = " + this.i);
}
public static void main(String[] args) {
B a = new A(); // <- upcasting here
System.out.println("i = " + a.i);
a.printI();
}
}
class B {
public int i = 1;
public void printI() {}
}
//Output:
//i = 1
//print i = 2
Seems, that upcasted object has two separate "i" properties. One "i" accessible directly (a.i) and the other through methods of child class (a.printI()).
Looks like upcasted object gets properties from superclass and methods from child class.
How object can have two separate "i"s?!
