Sams Teach Yourself Java 2 in 24 Hours

By Rogers Cadenhead

• Table of Contents
  • Copyright
  • About the Author
  • About the Technical Editor
  • Acknowledgments
  • We Want to Hear from You!
  • Reader Services
  • Introduction
  • Hour 1. Becoming a Programmer
  • Hour 2. Writing Your First Program
    • What You Need to Write Programs
    • Creating the Saluton Program
    • Beginning the Program
    • Storing Information in a Variable
    • Saving the Finished Product
    • Compiling the Program into a Class File
    • Fixing Errors
    • Workshop: Running a Java Program
    • Summary
    • Q&A
    • Quiz
    • Activities
  • Hour 3. Vacationing in Java
  • Hour 4. Understanding How Java Programs Work
  • Part II: Learning the Basics of Programming
  • Hour 5. Storing and Changing Information in a Program
  • Hour 6. Using Strings to Communicate
  • Hour 7. Using Conditional Tests to Make Decisions
  • Hour 8. Repeating an Action with Loops
  • Part III: Working with Information in New Ways
  • Hour 9. Storing Information with Arrays
  • Hour 10. Creating Your First Object
  • Hour 11. Describing What Your Object Is Like
  • Hour 12. Making the Most of Existing Objects
  • Part IV: Programming a Graphical User Interface
  • Hour 13. Building a Simple User Interface
  • Hour 14. Laying Out a User Interface
  • Hour 15. Responding to User Input
  • Hour 16. Building a Complex User Interface
  • Part V: Creating Multimedia Programs
  • Hour 17. Creating Interactive Web Programs
  • Hour 18. Handling Errors in a Program
  • Hour 19. Creating a Threaded Program
  • Hour 20. Reading and Writing Files
  • Part VI: Creating Multimedia Programs
  • Hour 21. Using Fonts and Color
  • Hour 22. Playing Sound Files
  • Hour 23. Working with Graphics
  • Hour 24. Creating Animation
  • Part VII: Appendixes
  • Appendix A. Tackling New Features of Java 2 Version 1.4
  • Appendix B. Using the Java 2 Software Development Kit
  • Appendix C. Programming with the Java 2 Software Development Kit
  • Appendix D. Using Sun ONE Studio
  • Appendix E. Where to Go from Here: Java Resources
  • Appendix F. This Book's Web Site

Quiz

Test your knowledge of the material covered in this chapter by answering the following questions.

Questions

1. When you compile a Java program, what are you doing?
   1. Saving it to disk
   2. Converting it into a form the computer can better understand
   3. Adding it to your program collection
2. What is a variable?
   1. Something that wobbles but doesn't fall down
   2. Text in a program that the compiler ignores
   3. A place to store information in a program
3. What is the process of fixing errors called?
   1. Defrosting
   2. Debugging
   3. Decomposing

Answers

1. b. Compiling converts a .java file into a .class file or set of .class files.
2. c. Variables are one place to store information; later you'll learn about others, such as arrays and constants. Weebles wobble but they don't fall down, and comments are text in a program that the compiler ignores.
3. b. Because errors in a computer program are called bugs, fixing those errors is called debugging. Some programming tools come with a tool called a debugger that helps you fix errors.

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