Java For Beginners: The Complete Guide To Learning Java for Beginners (Computer Programming) by Bruce Berke

Author:Bruce Berke [Berke, Bruce]
Language: eng
Format: epub
Published: 2018-05-31T18:30:00+00:00

class Cow extends Mammals {

public void drink() {

super.drink(); // to invoke method in super class

System.out.println("Cows can drink and eat");

}

}

public class TestCow {

public static void main(String args[]) {

Mammals c = new Cow(); // mammal reference but Cow object

c.drink(); // to execute method in Cow class

}

}

Chapter 9: Polymorphism

This feature allows us to perform an action through divergent ways. With polymorphism, one object may take different forms. Example:

public interface Animals{}

public class Mammals{}

public class Cow extends Animals implements Mammals{

}

The Cow class above has numerous inheritances, making it polymorphic. These references may be generated from above:

Cow c = new Cow();

Mammals m = c;

Animals an = c;

Object ob = c;

All above reference variables are referring to a similar object. All variables are referring to the same object.

Example:

class Cars{

void consume(){

System.out.println("Cars consume fuel");

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