Java/C2/First-Java-Program/English-timed

Time'	Narration
00:02	Welcome to the Spoken Tutorial on getting started with the First java program.
00:09	In this tutorial we will learn
00:11	To create a simple java program.
00:14	To compile the program.
00:16	To run the program. and
00:19	About the naming conventions followed in java
00:23	Here we are using Ubuntu version 11.10 and jdk 1.6
00:32	To follow this tutorial JDK 1.6 must be installed on your system.
00:39	If not, for relevant tutorial please visit our website which is as shown.
00:46	Alright now let us write our first java program.
00:51	For that you need a Terminal and you need a Text Editor.
00:56	I am using gedit as my Text Editor
01:01	In the text editor , we will first create the class HelloWorld.
01:06	So type class HelloWorld. HelloWorld is the name of the class.
01:17	And Open curly bracket. Enter and close curly bracket.
01:24	The code between this two curly brackets will belong to the class HelloWorld
01:33	Now save the file by clicking on Save icon at the top
01:37	It is a good practice to save the file frequently.
01:43	so Save As Dialog box appears.
01:46	Browse the location where you want to save your file.
01:51	Here, in the home directory i will create a folder.
01:57	Let us name it Demo and press enter
02:02	Then inside this folder we will save the file.
02:08	In the Name text-box, type the name of the class.
02:13	In java, the name of the class and the file name should be same.
02:20	Recall that we created class HelloWorld.
02:25	So we will save the file as HelloWorld dot java
02:33	Dot java is the file extension given to the java file.
02:39	Then click on Save button. So the file is now saved.
02:47	Inside the class, we write the main method.
02:53	So type:
02:54	public static void main parentheses inside parentheses String arg Square brackets
03:10	Main functions marks the starting point of the program.
03:15	We will describe public, static, void and String arg in a future tutorial.
03:23	Then once again, open curly bracket.
03:27	Press Enter and close curly bracket.
03:32	The code between these two curly brackets will belong to the main method.
03:41	We will now write a code to display a line on the Terminal.
03:46	So inside main method typeSystem dot out dot println parentheses semi-colon
03:59	This is the statement used to print a line.
04:05	semi-colon is used to terminate a line.
04:10	Now let us tell Java, what to print.
04:13	So Within parentheses in double quotes type, My first java program exclamation mark.
04:30	Let us Save the file by clicking on Save icon.
04:36	Let's go to Terminal.
04:38	Make sure that you are in the directory where you save your HelloWorld.java
04:46	Remember that I am in my home directory.
04:50	So type cd Space Demo and hit Enter
04:56	ls
04:59	We see HelloWorld.java file present in the Demo folder.
05:06	Lets compile this file so type javac Space HelloWorld dot java and hit enter
05:21	This compile the file that we have created.
05:25	Alright now the file is compiled as we see no error.
05:30	We can see HelloWorld.class file created.
05:36	This file can run anywhere.
05:38	That is, on any Operating System.
05:41	We do not need java compiler as well.
05:45	Hence, java is rightly described as “write once, run anywhere.”
05:51	So After successful compilation, run the program using the command,
05:56	java (This time no c) space HelloWorld (and no dot java) extension and hit Enter.
06:07	You will get the output My first java program!
06:13	So we have written our first java program.Let us go back to editor
06:22	Now, remove the semi-colon which is at the end of the statement.
06:27	Click on Save icon.
06:29	Let us go back to the Terminal.
06:33	Run the command javac HelloWorld dot java.
06:41	The compiler gives an error.
06:44	It says, a semi colon is expected on the fifth line.
06:52	The up arrow points to the error statement.
06:57	Let us go back to the Editor.
07:01	In Java, all statements are terminated with semicolons.
07:06	So go to the fifth line and add a semicolon.
07:13	Click on the Save icon. It is necessary to save the file before compiling
07:22	Let us go back to the Terminal.
07:25	Compile the file using javac HelloWorld dot java.
07:32	The file is successfully compiled as we see no errors.
07:36	Now, run the program using the command java HelloWorld and .
07:45	We see the output My first java program!
07:49	This is how you handle errors in java.
07:54	As the series progresses, we will learn more about the errors.
08:02	We now see what are the naming conventions in java.
08:06	* The class name should be in CamelCase.
08:10	* Which means each new word begins with an upper case.
08:14	* Example: class HelloWorld, class ChessGame.
08:19	So, H of hello and W of World are in uppercase.
08:25	Similarly C and G of Chess and Game respectively are in uppercase.
08:31	The method name should be the mixed case.
08:35	Which means that the first word should begin with a lower case.
08:39	And all new words followed should begin with an upper case.
08:44	Also the method name should be a verb.
08:48	For Example: showString(), main(), goToHelp(). Here s of show is in lowercase while S of string is in uppercase
09:02	The variable name should not begin with digits .
09:06	We cannot use keywords for our class, method or variable name.
09:13	For example: cannot use keywords like public, private, void, static and many more.
09:22	So in this tutorial, we have learnt to write, compile and run a simple java program.
09:30	We also saw the naming conventions followed in java.
09:35	For self assessment write a simple java program to print Java file name and class name should be same.
09:47	To know more about the Spoken Tutorial Project
09:50	Watch the video available at [1]
09:58	It summarises the Spoken Tutorial project
10:02	If you do not have good bandwidth, you can download and watch it
10:08	The Spoken Tutorial Project Team
10:10	Conducts workshops using spoken tutorials
10:13	Gives certificates to those who pass an online test
10:17	For more details, please write to contact@spoken-tutorial.org
10:25	Spoken Tutorial Project is a part of the Talk to a Teacher project
10:30	It is supported by the National Mission on Education through ICT, MHRD, Government of India
10:38	More information on this Mission is available at [2]
10:49	We have come to the end of this tutorial.
10:51	Thanks for joining.
10:53	This is Prathamesh Salunke signing off. Jai Hind.

Contributors and Content Editors

Arya Ratish, Ashwini, Gaurav, Kavita salve, PoojaMoolya, Pratik kamble, Priyacst, Sandhya.np14, Sneha, Vasudeva ahitanal