How to implement Polymorphism into my inheritance program?

Also how would add display method in each class. So the display method will display all of the data members for the class it is defined in.

I tried to use the display method...is it correct?

By the way I just started java programming so I am still learning. I'm just a beginner THANKS

package mainclass;

/**
 *
 * @author Jude Martin
 */
public class MainClass {

   
    public static void main(String[] args) {
        Animal anim = new Animal();
        Dog dog = new Dog();
        Cat cat = new Cat();
        
        dog.displayName();
        dog.pet();
        dog.status();
        
        cat.displayName();
        cat.pet();
        cat.status();
    }
}

SuperClass: Animal.java

package mainclass;

/**
 *
 * @author Jude Martin
 */
public class Animal {
    public boolean isAlive = true;
    
    public void pet() {
        System.out.println("I am a pet");
    }
}

Subclass: Dog.java

package mainclass;

/**
 *
 * @author Jude Martin
 */
public class Dog extends Animal {
    public String name = "Buddy";
    
    public void displayName() {
            System.out.println("My name is " + name);
    }
    public void status() {
            System.out.println("Living status:" + isAlive);
    }
}

Subclass: Cat.java

package mainclass;

/**
 *
 * @author Luis J
 */
public class Cat extends Animal {
     public String name = "Whiskers";
    
    public void displayName() {
            System.out.println("My name is " + name);
    }
    public void status() {
            System.out.println("Living status:" + isAlive);
}
}