Question

I have two example. First is true and second is wrong. It’s just different at one point: Animal class and Mammal class.

public class Inheritance {

    public static class Animal {        
        public void Scream() {
            System.out.println("I'm an animal");
        }       
    }

    public  static class Mammal extends Animal{
                   //no Scream method
    }

    public  static class Tiger extends Mammal{
        public void Scream(){
            System.out.println("I'm a tiger");
        }       
    }

    public static void main (String[] args){

        Animal tiger = new Tiger();
        tiger.Scream(); //True
    }
}

Second example:

public class Inheritance {

    public static class Animal {        
                 // no Scream method
    }

    public  static class Mammal extends Animal{
        public void Scream(){
            System.out.println("I'm a mammal");
        }       
    }

    public  static class Tiger extends Mammal{
        public void Scream(){
            System.out.println("I'm a tiger");
        }       
    }

    public static void main (String[] args){

        Animal tiger = new Tiger();
        tiger.Scream(); //false. Error
    }
}

Thanks 🙂

@: I have edited . I have typed mismatch.

Answer 1

I tested your 2 classes and they are both working.
I wouldn’t work if you try something like :
Animal tiger = new Tiger();
on the second case, because Animal has not Scream() method

BTW: Usually, method names start with lower case 😉