In Java, objects are passed by reference ... Suppose class Derived extends class Base, and we have an object of type Derived. We want to "extract" the base part from it. This does not work, because ...

That means java.lang.Object serves as the root class for all ... The following code implements the class Base: public class Base { public String m1() { return "Base.m1()"; } public String m2 ...

Last time, in ”Transitioning into object-oriented programming using Java,” we learned that ... we’ll create a class, known as a “base” or “super” class, called Animal.