Questions and Exercises: Nested Classes (The Java™ Tutorials > Learning the Java Language > Classes and Objects)
Trail: Learning the Java Language
Lesson: Classes and Objects
Classes and Objects
Classes
Declaring Classes
Declaring Member Variables
Defining Methods
Providing Constructors for Your Classes
Passing Information to a Method or a Constructor
Objects
Creating Objects
Using Objects
More on Classes
Returning a Value from a Method
Using the this Keyword
Controlling Access to Members of a Class
Understanding Instance and Class Members
Initializing Fields
Summary of Creating and Using Classes and Objects
Questions and Exercises
Questions and Exercises
Nested Classes
Inner Class Example
Summary of Nested Classes
Questions and Exercises
Enum Types
Questions and Exercises
Annotations
Questions and Exercises
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Questions and Exercises: Nested Classes

Questions

1. The program Problem.java doesn't compile. What do you need to do to make it compile? Why?

2. Use the Java API documentation for the Box class (in the javax.swing package) to help you answer the following questions.

a. What static nested class does Box define?
b. What inner class does Box define?
c. What is the superclass of Box’s inner class?
d. Which of Box’s nested classes can you use from any class?
e. How do you create an instance of Box’s Filler class?

Exercises

1. Get the file Class1.java.

Compile and run Class1. What is the output?
Check your answers.

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