1. USING ECLIPSE TO CREATE HELLO WORLD

2. Steps Create a Java project Define the build settings
Add a class to the project
Complete the code for the main procedure to write to the standard output device

3. Eclipse Default Workspace
When you start Eclipse, you must first select a workspace
The folder where your programs get stored
I suggest that you use a USB stick for all programs so put the default workspace there
That way you can access programs from any computer
The default workspace really nothing more than a folder where applications are stored

4. Eclipse Workspace (Example)
Select or create a default workspace

5. Creating a Java Project

6. Defining the Build Settings

7. Add a Class to the Project
Click File, New, Class to begin creating the first class

8. Create the code

9. Dissecting Hello World (1)
public class FirstSample {
public static void main(String[] args)
System.out.println("Z. Beeblebrox"); }
public is an access modifier

10. Dissecting Hello World (2)
public class FirstSample {
public static void main(String[] args)
System.out.println("Z. Beeblebrox"); }
Everything is a class

11. Dissecting Hello World (3)
public class FirstSample {
public static void main(String[] args)
System.out.println("Z. Beeblebrox"); }
The case sensitive class name is FirstSample

12. Dissecting Hello World (4)
public class FirstSample {
public static void main(String[] args)
System.out.println("Z. Beeblebrox"); }
Braces enclose all blocks including a class block

13. Dissecting Hello World (5)
public class FirstSample {
public static void main(String[] args)
System.out.println("Z. Beeblebrox"); }
Braces enclose all blocks including a procedure block

14. Dissecting Hello World (6)
public class FirstSample {
public static void main(String[] args)
System.out.println("Z. Beeblebrox"); }
The entry point is public

15. Dissecting Hello World (7)
public class FirstSample {
public static void main(String[] args)
System.out.println("Z. Beeblebrox"); }
static means the method is shared. It’s true for all program entry points!

16. Dissecting Hello World (8)
public class FirstSample {
public static void main(String[] args)
System.out.println("Z. Beeblebrox"); }
void means the method does not return a value. It’s the same as a Sub procedure in VB

17. Dissecting Hello World (9)
public class FirstSample {
public static void main(String[] args)
System.out.println("Z. Beeblebrox"); }
main is always the name of the entry point

18. Dissecting Hello World (10)
public class FirstSample {
public static void main(String[] args)
System.out.println("Z. Beeblebrox"); }
The method argument list (type varname)

19. Dissecting Hello World (11)
public class FirstSample {
public static void main(String[] args)
System.out.println("Z. Beeblebrox"); }
Brackets mark array arguments (like () in VB). The data type of the array is String

20. Dissecting Hello World (12)
public class FirstSample {
public static void main(String[] args)
System.out.println("Z. Beeblebrox"); }
We don’t use it but it’s the argument variable

21. Dissecting Hello World (13)
public class FirstSample {
public static void main(String[] args)
System.out.println("Z. Beeblebrox"); }
And finally the method call to print a message to the Console View