Interface:

Interface is a reference type in Java, which contains a collection of abstract methods. It is very similar to class, but it cannot be instantiated, rather it is implemented by other classes.

An interface needs to the follow certain conditions such as:

One cannot instantiate an interface.

Interfaces do not contain any constructors.

All methods present in the interface are abstracts.

An interface does not contain any instance field.

An interface cannot be extended by a class...

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Chapter 9.9, Problem 9.23CP

Chapter 9.9, Problem 9.25CP

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Chapter 9 Solutions

Starting Out with Java: Early Objects, Student Value Edition (6th Edition)

Ch. 9.1 - Here is the first line of a class declaration....Ch. 9.1 - Look at the following class declarations and...Ch. 9.1 - Class B extends class A. (Class A is the...Ch. 9.2 - Prob. 9.4CP Ch. 9.2 - Look at the following classes: public class Ground...Ch. 9.3 - Under what circumstances would a subclass need to...Ch. 9.3 - How can a subclass method call an overridden...Ch. 9.3 - If a method in a subclass has the same signature...Ch. 9.3 - If a method in a subclass has the same name as a...Ch. 9.3 - Prob. 9.10CP

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Solution Summary: The author explains that an interface is a reference type in Java, which contains abstract methods. It cannot be instantiated, rather it is implemented by other classes.

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