Java/C2/Errors-and-Debugging-in-Eclipse/English-timed

Time	Narration
00:01	Welcome to the tutorial on Errors and Debugging using Eclipse.
00:07	In this tutorial, we are going to learn:
00:10	what are the possible errors while writing a simple Java program,
00:14	how to identify those errors and rectify them using eclipse.
00:20	For this tutorial we are using Ubuntu 11.10 and Eclipse 3.7.
00:27	To follow this tutorial, you must know
00:30	how to create and run a Java Program in Eclipse.
00:33	If not, for relevant tutorial please visit our website as shown. [1]
00:41	In a simple Java program, the typical errors could be:
00:45	* Missing semicolon(;)
00:47	* Missing double quotes(" ") around the message
00:50	* Mis-match of filename and classname and
00:52	* Typing the print statement in lower-case.
00:55	We shall write a program and then make each of these errors and see what happens in Eclipse.
01:04	Here we have the Eclipse IDE and the project used for the HelloWorld tutorial.
01:11	We shall create a new class in the project and use it. New Class. Let us name the class ErrorFree and select methods stubs public static void main.
01:37	Let us minimize the package explorer. Remove the comments and add the print statement with a few errors.
02:23	In Eclipse, the line which has the error will be indicated with a red cross mark on the left margin.
02:35	In this case, the System.out.println line has an error and hence there is a red cross mark on the left.
02:44	The list of errors is displayed by hovering the mouse over the cross mark.
02:51	The first error displayed is: syntax error, insert semi-colon to complete block statements.
02:58	This is because we have to end every statement of a program with a semicolon.
03:03	So, let us insert semicolon at the end of the statement.
03:08	Save the file with Ctrl s.
03:16	Notice that once we add the semi-colon and save the file, the first error is gone.
03:21	There is only one error now which says: Helloworld cannot be resolved to a variable which means to display any message on the console the message has to be included in double quotes.
03:37	Without the quotes, Java thinks that HelloWorld is the name of a variable.
03:41	Let us add double quotes before and after the message.
03:55	Ctrl s to Save. We see that the red cross mark is gone and the program is error free. So, let us run the program and see what happens.
04:10	Run as > Java applications
04:15	We see that the message has been printed on the console.
04:22	Let us look at the next error.
04:25	It happens due to a mismatch of file name and class name.
04:29	It does not happens usually on Eclipse.
04:31	This is because we use the New Class wizard to create a file and eclipse
04:39	creates a file automatically.
04:41	But if we create a Java file outside of Eclipse and add it to a project, there is a chance of the error.
04:47	So let us stimulate the error by changing the class name.
04:59	Since Java is case sensitive, now the class name and file name do not match .
05:09	Notice that there is a red cross mark on the left margin.
05:14	And error message reads The public type errorfree must be defined in its own file.
05:20	Also notice that the word errorfreeis underlined in red colour.
05:29	Eclipse offers intelligent fixes and we have 2 fixes available here.
05:35	The first one is Rename compilation unit to errorfree java
05:39	The second one is Rename the type to errorfree.
05:43	The fix that we are looking for is the second one. And we see that once you rename the file,the class back to 'ErrorFree', the error here is missing.
06:03	The next error happens due to typing mistakes in the print statement.
06:09	Let us replace the capital S with a small s.
06:15	We notice that there is the red-cross mark
06:18	and error message reads system cannot be resolved.
06:23	This means, Java is expecting a class or object or a variable by the name 'system'.
06:28	But there is nothing like 'system' object in the code.
06:33	So, let us look at the possible fixes.
06:39	There are 11 fixes, out of these the fix that we are looking for is the eighth option:
06:48	Change to 'System' (java.lang)
06:58	You can see that once we change it to capital 'S' the error is missing.
07:06	Here is how you identify errors in Java using eclipse and rectify them.
07:15	This brings us to the end of this tutorial.
07:18	In this tutorial we have seen:
07:20	what are the typical errors while writing a Java program and
07:23	how to identify them and rectify them using Eclipse.
07:30	As an assignment for this tutorial, find out the errors in the code given below and fix them.
07:39	To know more about the Spoken Tutorial project,
07:42	watch the video available at the following link. It summarizes the project.
07:48	If you do not have good bandwidth, you can download and watch it.
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08:07	Spoken Tutorial Project is a part of the Talk to a Teacher project.
08:11	It is supported by the National Mission on Education through ICT, MHRD, Government of India.
08:17	More information on this Mission is available at spoken HYPHEN tutorial DOT org SLASH NMEICT HYPHEN Intro
08:23	This tutorial has been contributed by TalentSprint. Thanks for joining.

Contributors and Content Editors

Gaurav, Madhurig, PoojaMoolya, Pravin1389, Sandhya.np14, Sneha