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

Saving the Finished Product

Your program should now resemble Listing 2.2, although you might have used slightly different spacing in Lines 3–4. Make any corrections that are needed and save the file as Saluton.java. Keep in mind that all Java programs are created as text files and are saved with the .java file extension.

Example 2.2. The Finished Version of the Saluton Program

1: class Saluton { 
2:     public static void main(String[] arguments) { 
3:         String greeting = "Saluton mondo!"; 
4:         System.out.println(greeting); 
5:     } 
6: } 

When the computer runs this program, it will run each of the statements in the main statement block on Lines 3 and 4. Listing 2.3 shows what the program would look like if it were written in the English language instead of Java.

Example 2.3. A Line-by-Line Breakdown of the Saluton Program

1: The Saluton program begins here: 
2:     The main part of the program begins here: 
3:         Store the text "Saluton mondo!" in a String variable named greeting 
4:         Display the contents of the variable greeting 
5:     The main part of the program ends here. 
6: The Saluton program ends here. 

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