E8_Parent/Child

class ParentClass {
    public void parentMethod() {
        System.out.println("This is parent class");
    }
}

class ChildClass extends ParentClass {
    public void childMethod() {
        System.out.println("This is child class");
    }
}

public class Main {
    public static void main(String[] args) {
        ParentClass parentObject = new ParentClass();

        ChildClass childObject = new ChildClass();


        parentObject.parentMethod();


        childObject.childMethod();
        childObject.parentMethod();
    }
}