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
  • 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
    • Animating a Sequence of Images
    • Sending Parameters to the Applet
    • Workshop: Follow the Bouncing Ball
    • Summary
    • Q&A
    • Quiz
    • Activities
  • 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

Animate yourself as much as you can muster and answer the following questions to test your skills.

Questions

1. Where is the (0,0) coordinate on a container?
   1. In an offscreen double-buffering area
   2. The exact center of the window
   3. The upper-left corner of the container
2. What thing did you not learn during this hour?
   1. How to load images in an application
   2. How to make sure an image is not displayed until it loads
   3. Why the tennis ball is bouncing off thin air instead of the ground in the BouncePanel application.
3. In a threaded animation applet, where should you handle most of the movement of an image?
   1. The run() method
   2. The init() method
   3. The paint() method

Answers

1. c. The x value increases as you head to the right, and the y value increases as you head downward.
2. c. Would you believe clear-air turbulence?
3. a. Some movement might be handled by statements in the paint() method, but most of it will take place in run() or a method called from within run().

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