---

abstraction

 09-05-2022

abstraction in java

import java.util.Scanner;

abstract class Animal { 
	public abstract void eat();
	public abstract void sleep();
	public abstract void makeSound();
}

class Bird extends Animal {
	public void eat() {
		System.out.println("Birds love to eat seeds.");
	}
	
	public void sleep() {
		System.out.println("Sleep for 10-12 hours a day.");
	}
	
	public void makeSound() {
		System.out.print("Tweet tweet tweet...");
	}
}

class Cat extends Animal {
	public void eat() {
		System.out.println("Cats love to eat salmon.");
	}
	
	public void sleep() {
		System.out.println("Sleep for 12-14 hours a day.");
	}
	
	public void makeSound() {
		System.out.print("Meow meow meow...");
	}
	
}

class Dog extends Animal {
	public void eat() {
		System.out.println("Dogs love to eat vegetables.");
	}
	
	public void sleep() {
		System.out.println("Sleep for 8-12 hours a day.");
	}
	
	public void makeSound() {
		System.out.print("Arf arf arf...");
	}
	
}

public class RunAnimal {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		System.out.println("Choose an animal. Press B for Bird, C for Cat, or D for Dog:");
		char choice = scan.next().charAt(0);
		switch(Character.toUpperCase(choice)) {
		  case 'B':
			  Bird b = new Bird();
			  b.eat();
			  b.sleep();
			  b.makeSound();
		    break;
		  case 'C':
			  Cat c = new Cat();
			  c.eat();
			  c.sleep();
			  c.makeSound();
			break;
		  case 'D':
			Dog d = new Dog();
			  d.eat();
			  d.sleep();
			  d.makeSound();
			  break;
		  default:
			  System.out.print("Invalid input, please restart the program.");
		}		
	}
}