Interfaces & Abstract Classes

Interface ,[object Object],[object Object],[object Object]

Which is a better design pattern? ,[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],When we think of objects, We assume it as programmatic representations of real-world entities. Confused, isn’t it ?

Think ,[object Object],[object Object]

Interfaces & Polymorphism ,[object Object],[object Object]

What’s this Polymorphism? ,[object Object],[object Object],abstract class Animal { abstract void talk(); } class Dog extends Animal { void talk() { System.out.println("Woof!"); } } class Cat extends Animal { void talk() { System.out.println("Meow."); } } class Interrogator { static void makeItTalk(Animal subject) { subject.talk(); } }

Polymorphism contd. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],class Bird extends Animal { void talk() { System.out.println("Tweet, tweet!"); } } Do we need to change the makeItTalk() method??

Polymorphism contd. ,[object Object],[object Object],interface Talkative { void talk(); } abstract class Animal implements Talkative { abstract public void talk(); } class Dog extends Animal { public void talk() { System.out.println("Woof!"); } } class Cat extends Animal { public void talk() { System.out.println("Meow."); } } class Interrogator { static void makeItTalk(Talkative subject) { subject.talk(); } }

Polymorphism contd. ,[object Object],class Clock { } class CuckooClock implements Talkative { public void talk() { System.out.println("Cuckoo, cuckoo!"); } } class Test { public static void main(String[] args) { CuckooClock cc = new CuckooClock(); Interrogator.makeItTalk(cc); } }

Polymorphism contd. ,[object Object],With single inheritance only, we'd either have to somehow fit CuckooClock into the Animal family, or not use polymorphism. With interfaces, any class in any family can implement Talkative and be passed to makeItTalk(). This is why we say interfaces provide more polymorphism than we can get with singly inherited families of classes.

Using Interfaces ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Interfaces & Abstract Classes

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