Inheritance(Single level)

public class inheritance {

    public static void main(String[] args) {

        Fish shark = new Fish();

        shark.eat();

    }

}

// BASE CLASS

class Animal {

    String color;

    void eat() {

        System.out.println("eats");

    }

    void breath() {

        System.out.println("Breathes");

    }

}

// DERIVED CLASS

class Fish extends Animal {

    int fins;

    void swims() {

        System.out.println("swims");

    }

}