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Trail: Learning the Java Language
Lesson: Object-Oriented Programming Concepts
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Answers to Questions and Exercises: Object-Oriented Programming Concepts

> ### Answers to Questions

> 1. Real-world objects contain state and behavior.

> 2. A software object's state is stored in fields.

> 3. A software object's behavior is exposed through methods.

> 4. Hiding internal data from the outside world, and accessing it only through publicly exposed methods is known as data encapsulation.

> 5. A blueprint for a software object is called a class.

> 6. Common behavior can be defined in a superclass and inherited into a subclass using the extends keyword.

> 7. A collection of methods with no implementation is called an interface.

> 8. A namespace that organizes classes and interfaces by functionality is called a package.

> 9. The term API stands for Application Programming Interface.

> ### Answers to Exercises

> 1. Your answers will vary depending on the real-world objects that you are modeling.

> 2. Your answers will vary here as well, but the error message will specifically list the required methods that have not been implemented.

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