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Interfaces and Inheritance
Interfaces
Defining an Interface
Implementing an Interface
Using an Interface as a Type
Evolving Interfaces
Default Methods
Summary of Interfaces
Questions and Exercises
Inheritance
Multiple Inheritance of State, Implementation, and Type
Overriding and Hiding Methods
Polymorphism
Hiding Fields
Using the Keyword super
Object as a Superclass
Writing Final Classes and Methods
Abstract Methods and Classes
Summary of Inheritance
Questions and Exercises
Trail: Learning the Java Language
Lesson: Interfaces and Inheritance
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# Questions and Exercises: Inheritance

## Questions

1. Consider the following two classes:

    public class ClassA {
        public void methodOne(int i) {
        }
        public void methodTwo(int i) {
        }
        public static void methodThree(int i) {
        }
        public static void methodFour(int i) {
        }
    }

    public class ClassB extends ClassA {
        public static void methodOne(int i) {
        }
        public void methodTwo(int i) {
        }
        public void methodThree(int i) {
        }
        public static void methodFour(int i) {
        }
    }

a. Which method overrides a method in the superclass?
b. Which method hides a method in the superclass?
c. What do the other methods do?
2. Consider the `Card`, `Deck`, and `DisplayDeck` classes you wrote in Questions and Exercises: Classes. What `Object` methods should each of these classes override?

## Exercises

1. Write the implementations for the methods that you answered in question 2.

Check your answers.

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