| Visual Cue
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Description
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| Slide 1
Welcome
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Welcome to the spoken tutorial on HelloWorld in Java on Eclipse.
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| Slide 2
Learning Outcomes
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In this tutorial, you will learn to write a simple program in Java using Eclipse.
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| Slide 3
Tools Used
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For this tutorial we are using
Eclipse 3.7.0 and
Ubuntu 11.10
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| Slide 4
Pre-requisites
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For this tutorial, you should have Eclipse installed on your system.
You should know how to create, save and run a file in Eclipse.
If not, for relevant tutorial please visit our website as shown.
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| Slide 5
"HelloWorld"
System.out.println("Hello World");
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Here is the java program that prints the message Hello World
Let us try this program on Eclipse.
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| Minimize slides and launch Eclipse
Alt + F2 > eclipse
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Press Alt and F2 and type eclipse in the dialog box and hit enter.
We see the Eclipse IDE.
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| Click on File > New > Project
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Now we will create a project.
So click on File menu, go to New option and click on Project option.
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| Select Java Project.
Click Next
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Select Java Project option in the list of Wizards and click Next.
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| Type DemoProject
Click Finish
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Type DemoProject (without spaces) in the project name.
Note that the D and P in the project name are in uppercase.
Click on Finish
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| Point to the Project Explorer portlet on the left.
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Now Right click on the DemoProject and go to New option and select Class
This opens a New Java Class Portlet
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| Point to the New Java Class portlet
Point to the list of method stubs
Click Finish
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Type DemoClass (without spaces) in the Name field.
Note that the D and C in the class name are in upper case.
Select the public static void main option.
Then click on Finish at the bottom right corner of the wizardPrathamesh Salunke:
Also try to keep one activity in one row..
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| Point to the src directory in Project Explorer Portlet
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Eclipse creates a file with the name called DemoClass.java .
It is in the src directory of our project.
In Java, every class is a file.
So, the Class name and the File name must match.
In our case, class name is DemoClass and hence the file name will be DemoClass.java
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| Point to the “code editor”
Type in Eclipse
After the line “public static void main”
System
System.out.println(
System.out.println(“)
System.out.println(“HelloWorld”);
Press Ctrl + S
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As we can see, Eclipse has filled most of the code in the program.
We will learn about all this once we get some output.
Let us type the print statement.
As we can see, Eclipse suggests various possibilities as we type a command.
Let us complete the command.
Eclipse also completes the parentheses by automatically adding the closing parentheses.
Let us add the statement that we want to print.
The message has to be included in double quotes.
As we can see, Eclipse also completes the quotes by adding the closing quote.
There is a semicolon at the end of the statement.
Every statement in Java must end with a semicolon.
Now our program is complete.
Save the file by pressing Ctrl + S simultaneously..
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| Click on the code editor
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Now let us compile and execute the program.
Right click on the source code, go to Run as option, and then click java application.
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| Point to output console at the botom of the code editor
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The output message HelloWorld is displayed in the console window.
So we have written a simple java program and executed it successfully.
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| Replace HelloWorld with Hello Java and run the code.
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Now, let us change the code to print a different message.
Replace HelloWorld with Hello Java and run the code.
As we can see, the message printed now is Hello Java
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| Point to the line public class DemoProgram
Point to the line public static void...
Point to the opening and closing braces
Select from opening to closing braces of the class.
Select from opening to closing braces of the main method.
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Now let us understand the program piece by piece.
The line class DemoProgram indicates that the name of our class is DemoProgram.
This is required since every source file in java is a class.
The next line defines the main method.
It is the code inside main method that will be executed when you run a java program.
The opening and closing braces suggest which part of code goes under which name.
This block of code belongs to the DemoProgram class.
This block of code belongs to the main method.
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| Minimize the Eclipse window and switch to slides.
Slide 6
Summary
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We have come to the end of this tutorial.
In this tutorial we have learnt how to write 'HelloWorld' program using Eclipse.
We have also understood what each piece of the program does.
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| Slide 7Assignment
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Create a java class by the name Greet that prints Program Successful when executed.
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Slide 8About the Spoken Tutorial Project
- It summarises the Spoken Tutorial project
- If you do not have good bandwidth, you can download and watch it
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To know more about the Spoken Tutorial project, watch the video available at the following link, that summarises the project.Alternatively, you can download and watch it.
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Slide 9Spoken Tutorial WorkshopsThe Spoken Tutorial Project Team
- Conducts workshops using spoken tutorials
- Gives certificates for those who pass an online test
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The Spoken Tutorial Project Team.
Conducts workshops using spoken tutorials.
Gives certificates for those who pass an online test. For more details, please write to contact AT spoken HYPHEN tutorial DOT org.
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Slide 10Acknowledgement
- Spoken Tutorial Project is a part of the Talk to a Teacher project
- It is supported by the National Mission on Education through ICT, MHRD, Government of India
- More information on this Mission is available at
http://spoken-tutorial.org/NMEICT-Intro
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Spoken Tutorial Project is a part of the Talk to a Teacher project.
It is supported by the National Mission on Education through ICT, MHRD, Government of India.
More information on this Mission is available at spoken HYPHEN tutorial DOT org SLASH NMEICT HYPHEN Intro
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Slide 11About the contributor
- This tutorial has been contributed by TalentSprint
- www.talentsprint.com
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This tutorial has been contributed by TalentSprint.
Thanks for joining.
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