Java/C2/Errors-and-Debugging-in-Eclipse/Kannada - Revision history

Vasudeva ahitanal at 11:01, 27 August 2014

2014-08-27T11:01:35Z

Vasudeva ahitanal at 11:45, 1 July 2014

2014-07-01T11:45:44Z

Vasudeva ahitanal at 04:50, 24 June 2014

2014-06-24T04:50:20Z

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Vasudeva ahitanal: Created page with '{| border=1 || '''Time''' || '''Narration''' |- | 00:01 | Welcome to the tutorial on '''Errors and Debugging using Eclipse.''' |- | 00:07 | In this tutorial,we are going to…'

2014-06-11T04:57:56Z

Created page with '{| border=1 || '''Time''' || '''Narration''' |- | 00:01 | Welcome to the tutorial on '''Errors and Debugging using Eclipse.''' |- | 00:07 | In this tutorial,we are going to…'

New page

{| border=1
|| '''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 [http://spoken-tuitorial.org/ ][http://spoken-tuitorial.org/ http][http://spoken-tuitorial.org/ ://][http://spoken-tuitorial.org/ spoken][http://spoken-tuitorial.org/ -][http://spoken-tuitorial.org/ tuitorial][http://spoken-tuitorial.org/ .][http://spoken-tuitorial.org/ org]

|-
| 00:41
| In a simple '''Java program''', the typical errors could be.

|-
| 00:45
| Missing semicolon(;)
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| 00:47
| Missing double quotes(" ") around the message
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| 00:50
| Mis-match of filename and classname and
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| 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.

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| 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.

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| 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.

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| 04:25
|It happens due to a mismatch of '''file name''' and '''class name.'''

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| 04:29
|It does not happens usually on '''Eclipse.'''

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| 04:31
|This is because we use the '''New Class wizard''' to create a file and eclipse

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| 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 '''errorfree'''is ''' underlined in red colour.

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| 05:29
| ''' Java offers intelligent fixes and we have 2 fixes available here

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| 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 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

|-
| 07:39
|To know more about the '''Spoken Tutorial''' project,

|-
| 07:42
| Watch the video available at the following link, It summarises the project.

|-
| 07:48
|If you do not have good bandwidth, you can download and watch it

|-
| 07:53
| The Spoken Tutorial Team conducts workshops using '''spoken tutorials'''.

|-
| 07:57
|Gives certificates for those who pass an online test. For more details, please write to

'''contact AT spoken HYPHEN tutorial DOT org.'''

|-
| 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.
|-

@@ Line 31: / Line 31: @@
 |-
 |00:45
-|ಸೆಮಿಕೊಲನ್ ನ (;) ಕಾಣೆಯಾಗುವುದು,
+|ಸೆಮಿಕೊಲನ್ ನ (;) ಕಾಣೆಯಾಗುವಿಕೆ,
 |-
 |00:47
-|ಸಂದೇಶದ ಆಚೆ-ಈಚೆ ಇರುವ ಡಬಲ್ ಕೋಟ್ ನ(" ") ಕಾಣೆಯಾಗುವುದು,
+|ಸಂದೇಶದ ಆಚೆ-ಈಚೆ ಇರುವ ಡಬಲ್ ಕೋಟ್ ನ(" ") ಕಾಣೆಯಾಗುವಿಕೆ,
 |-
 |00:50
@@ Line 49: / Line 49: @@
 |-
 |01:11
-|ನಾವು ಪ್ರೊಜೆಕ್ಟ್ ನಲ್ಲಿ ಹೊಸ ಕ್ಲಾಸ್ ಅನ್ನು ರಚಿಸಿ ಉಪಯೋಗಿಸಬಹುದು. New…… Class. ನಾವು ಕ್ಲಾಸ್ ಗೆ Error Free ಎಂದು ಹೆಸರಿಟ್ಟು methods stubs ಅನ್ನು public static Void main ಎಂದು ಆಯ್ಕೆಮಾಡಿ.
+|ನಾವು ಪ್ರೊಜೆಕ್ಟ್ ನಲ್ಲಿ ಹೊಸ ಕ್ಲಾಸ್ ಅನ್ನು ರಚಿಸಿ ಉಪಯೋಗಿಸಬಹುದು. New…… Class. ನಾವು ಕ್ಲಾಸ್ ಗೆ Error Free ಎಂದು ಹೆಸರಿಟ್ಟು methods stubs ಅನ್ನು public static Void main ಎಂದು ಆಯ್ಕೆಮಾಡೋಣ.
 |-
 |01:37
@@ Line 127: / Line 127: @@
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 |05:29
-|ಎಕ್ಲಿಪ್ಸ್ ನಮಗೆ ಉತ್ತಮ ಪರಿಹಾರಗಳನ್ನು ಸೂಚಿಸುತ್ತವೆ ಹಾಗೂ ನಾವಿಲ್ಲಿ ಎರಡು ಪರಿಹಾರಗಳನ್ನು ಹೊಂದಿದ್ದೇವೆ.
+|ಎಕ್ಲಿಪ್ಸ್ ನಮಗೆ ಉತ್ತಮ ಪರಿಹಾರಗಳನ್ನು ಸೂಚಿಸುತ್ತದೆ ಹಾಗೂ ನಾವಿಲ್ಲಿ ಎರಡು ಪರಿಹಾರಗಳನ್ನು ಹೊಂದಿದ್ದೇವೆ.
 |-
 |05:35

@@ Line 4: / Line 4: @@
 |-
 |00:01
-|ಎಕ್ಲಿಪ್ಸ್ ನಲ್ಲಿ ದೋಷಗಳು ಹಾಗೂ ಅವುಗಳ ನಿವಾರಣೆಯ ಬಗ್ಗೆ ಇರುವ ಈ ಟ್ಯುಟೋರಿಯಲ್ ಗೆ ನಿಮಗೆ ಸ್ವಾಗತ.
+|ಎಕ್ಲಿಪ್ಸ್ ನಲ್ಲಿ ದೋಷಗಳು ಹಾಗೂ ಅವುಗಳ ನಿವಾರಣೆಯ ಬಗ್ಗೆ ಇರುವ ಈ ಸ್ಪೋಕನ್ ಟ್ಯುಟೋರಿಯಲ್ ಗೆ ನಿಮಗೆ ಸ್ವಾಗತ.
 |-
 |00:07
@@ Line 46: / Line 46: @@
 |-
 |01:04
-|ನಾವು Eclipse IDE ಮತ್ತು HelloWorld ನ ಟ್ಯುಟೋರಿಯಲ್ ಗೆ ಬಳಸಿದ ಪ್ರೊಜೆಕ್ಟ್ ಇದೆ.
+|ನಮ್ಮಲ್ಲಿ Eclipse IDE ಮತ್ತು HelloWorld ನ ಟ್ಯುಟೋರಿಯಲ್ ಗೆ ಬಳಸಿದ ಪ್ರೊಜೆಕ್ಟ್ ಇದೆ.
 |-
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@@ Line 106: / Line 106: @@
 |-
 |04:31
-|ಏಕೆಂದರೆ, ನಾವು ಕ್ಲಾಸ್ ಅನ್ನು ರಚಿಸಲು New Class wizard ಅನ್ನು ಬಳಸುತ್ತೇವೆ ಮತ್ತು ಎಕ್ಲಿಪ್ಸ್ ಫೈಲ್ ಅನ್ನು ತಂತಾನೇ ರಚಿಸುತ್ತದೆ.
+|ಏಕೆಂದರೆ, ನಾವು ಫೈಲ್ ಅನ್ನು ರಚಿಸಲು New Class wizard ಅನ್ನು ಬಳಸುತ್ತೇವೆ ಮತ್ತು ಎಕ್ಲಿಪ್ಸ್ ಫೈಲ್ ಅನ್ನು ತಂತಾನೇ ರಚಿಸುತ್ತದೆ.
 |-
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@@ Line 169: / Line 169: @@
 |-
 |07:06
-|ಹೀಗೆ ನಾವು ಎಕ್ಲಿಪ್ಸ್ ನ ಸಹಾಯದಿಂದ ಜಾವಾದಲ್ಲಿ ನಲ್ಲಿ ದೋಷವನ್ನು ಗುರುತಿಸುತ್ತೇವೆ ಮತ್ತು ಅದನ್ನು ಸರಿಪಡಿಸುತ್ತೇವೆ.
+|ಹೀಗೆ ನಾವು ಎಕ್ಲಿಪ್ಸ್ ನ ಸಹಾಯದಿಂದ ಜಾವಾದಲ್ಲಿ ನಲ್ಲಿನ ದೋಷವನ್ನು ಗುರುತಿಸುತ್ತೇವೆ ಮತ್ತು ಅದನ್ನು ಸರಿಪಡಿಸುತ್ತೇವೆ.
 |-
 |07:15
-|This brings us to the end of this tutorial.
+|ಇಲ್ಲಿಗೆ ನಾವು ಈ ಟುಟೋರಿಯಲ್ ನ ಅಂತ್ಯಕ್ಕೆ ಬಂದೆವು.
 |-
 |07:18