Question

How to implement polymorphism in Java

Answer 1

package javaapplication1;

public class Animal {
   	public String type;
	public String mammal;
 
	public Animal(String type, String mammal) {
		this.type = type;
		this.mammal = mammal;
	}
 
	public void showDetails() {
		System.out.print(type + " makes sound.");
	} 
}

package javaapplication1;

public class Dog extends Animal {
	public Dog(String type, String mammal) {
		super(type, mammal);
	}
 
	public void showDetails() {
		super.showDetails();
		System.out.println(" is mammal? " + mammal);
	}
}

package javaapplication1;

public class Bird extends Animal {
	public Bird(String type, String mammal) {
		super(type, mammal);
	}
 
	public void showDetails() {
		super.showDetails();
		System.out.println(" is mammal? " + mammal);
	}
}

package javaapplication1;

public class PolymorphismTest {
    	public static void main(String[] args) {
		Animal dog = new Dog("Dog", "yes");
		Animal bird = new Bird("Bird", "no");
 
		dog.showDetails();
		bird.showDetails();
	}
}

/*
run:

Dog makes sound. is mammal? yes
Bird makes sound. is mammal? no

*/

 

70+ SQL courses for beginners and professionals

Answer 2

package javaapplication1;

public class Animal {
   	public String type;
	public String mammal;
 
	public Animal(String type, String mammal) {
		this.type = type;
		this.mammal = mammal;
	}
 
	public void showDetails() {
		System.out.print(type + " makes sound.");
	} 
}

package javaapplication1;

public class Dog extends Animal {
	public Dog(String type, String mammal) {
		super(type, mammal);
	}
 
    private String dogTalent = "sense of smell";
        
	public void showDetails() {
		super.showDetails();
		System.out.println(" is mammal? " + mammal + ". dog talent: " + dogTalent);
	}
}

package javaapplication1;

public class Bird extends Animal {
	public Bird(String type, String mammal) {
		super(type, mammal);
	}
 
    private String birdTalent = "can fly";
        
	public void showDetails() {
		super.showDetails();
		System.out.println(" is mammal? " + mammal + ". bird talent: " + birdTalent);
	}
}

package javaapplication1;

public class PolymorphismTest {
    	public static void main(String[] args) {
		Animal dog = new Dog("Dog", "yes");
		Animal bird = new Bird("Bird", "no");
 
		dog.showDetails();
		bird.showDetails();
	}
}

/*
run:

Dog makes sound. is mammal? yes. dog talent: sense of smell
Bird makes sound. is mammal? no. bird talent: can fly

*/

 

70+ SQL courses for beginners and professionals