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 error 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]http://spoken-tuitorial.org
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	And 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 Error Free and select methods stubs public static Void main
01:37	Let us minimise the package explorer. Remove the comments and add the print statement to the 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 errors and hence their is the 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	their is only one error now which says; hello world 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 have 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, their is the 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	Java 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 error.
05:43	The fix that we are looking to 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 their 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, 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 error in the code given below and fix them
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08:11	It is supported by the National Mission on Education through ICT, MHRD, Government of India.
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08:23	This tutorial has been contributed by TalentSprint. Thanks for joining.

Contributors and Content Editors

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