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What the book is referring to is polymorphism, more specifically through dynamic dispatch. In a nutshell, imagine the following classes.

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The first statement just creates a reference, or a pointer if you will, to an instance of type Employee. So, here you create a reference and an object that the reference variable refers to. What is the difference between instance variable and objects?.

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Reference variables can be declared as static variables, instance package org. echographapp.com; public class ReferenceDemo.

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Reference variables are used to refer to an object. They are declared with a specific type which cannot be changed.

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Java programming is intimately involved with object-oriented A reference is an address that indicates where an object's variables and.

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There are two types of variables in Java, primitive and reference type. All the basic types e.g. int, boolean, char, short, float, long and double are.