Difference between revisions of "Netbeans/C2/Netbeans-Debugger/English-timed"

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|by clicking on the ''' Debug Project''' button in the toolbar,  
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|by clicking on the '''Debug Project''' button in the toolbar,  
  
 
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|-
 
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| 02:52
 
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|You can see that there are some additional windows below the workspace.  
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|You can see that there are some additional windows below the '''workspace'''.  
  
 
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| 03:19
 
| 03:19
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|There is also a  ''' 'Debugger Console' '''' that says that the program hit a breakpoint on line 29 and has stopped there.  
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|There is also a  '''Debugger Console''' that says that the program hit a breakpoint on line 29 and has stopped there.  
  
 
|-
 
|-
 
| 03:28
 
| 03:28
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|There is also a ''''Breakpoints' ''' window that tells you that a breakpoint has been set on line number 29.  
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|There is also a '''Breakpoints''' window that tells you that a breakpoint has been set on line number 29.  
  
 
|-
 
|-
 
| 03:36
 
| 03:36
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|Before proceeding, let us see how to add a watch.  
+
|Before proceeding, let us see how to add a '''watch'''.  
  
 
|-
 
|-
 
| 03:40
 
| 03:40
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|For example, let us say I want to watch on the integer value ''' 'aSample'. '''
+
|For example, let us say I want to watch on the integer value 'aSample'.  
  
 
|-
 
|-
 
| 03:48
 
| 03:48
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|In the 'Variables' window below the workspace, I will double-click on  the '''Enter new Watch''' option and enter the name of the variable  ''' 'aSample.value'. '''
+
|In the 'Variables' window below the '''workspace''', I will double-click on  the '''Enter new Watch''' option and enter the name of the variable  "aSample.value".
  
 
|-
 
|-
 
| 04:02
 
| 04:02
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|Click on '''OK. '''
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|Click on '''OK.'''
  
 
|-
 
|-
 
| 04:06
 
| 04:06
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|So far ''' 'aSample' ''' has not been created so it says it does not know the value.  
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|So far, 'aSample' has not been created. So, it says it does not know the value.  
  
 
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|-
 
| 04:12
 
| 04:12
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|Once it executes the line we'll know what the variable contains.  
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|Once it executes the line, we'll know what the variable contains.  
  
 
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| 04:25
 
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|What if I wanted to know what a-4 is.  
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|What if I wanted to know what 'a-4' is.  
  
 
|-
 
|-
 
| 04:29
 
| 04:29
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|So let me go to the '''Debug''' menu in the menu bar, and select '''Evaluate expression''' option.  
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|So, let me go to the '''Debug''' menu in the menu bar and select '''Evaluate expression''' option.  
  
 
|-
 
|-
 
| 04:37
 
| 04:37
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|The ''' 'Evaluate Code' ''' window appears in the workspace.  
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|The ''''Evaluate Code'''' window appears in the workspace.  
  
 
|-
 
|-
 
| 04:41
 
| 04:41
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|Here I will enter the expression ''' 'a-4'.'''
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|Here, I will enter the expression 'a-4'.  
  
 
|-
 
|-
 
| 04:45
 
| 04:45
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|Click on the '''Evaluate Expression button''' here, and in the Variable window, it says ''' 'a-4' '''s value is 6.  
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|Click on the '''Evaluate Expression button''' here and in the '''Variable''' window, it says (a-4)'s value is 6.  
  
 
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| That says, '''Hello World! a is 10. '''
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| that says, '''Hello World! 'a' is 10. '''
  
 
|-
 
|-
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|-
 
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| 05:28
 
| 05:28
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|Now, I want to go into the constructor of the ''' SampleClass.'''  
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|Now, I want to go into the '''constructor''' of the ''' SampleClass.'''  
  
 
|-
 
|-
 
| 05:32
 
| 05:32
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|To that I can choose the ''' Step Into''' option from the toolbar.  
+
|To do that, I can choose the ''' Step Into''' option from the toolbar.  
  
 
|-
 
|-
 
| 05:41
 
| 05:41
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|Then I can choose ''' Step Over''' and see that the value came inside the constructor call is now set to 10.  
+
|Then I can choose ''' Step Over''' and see that the value came inside the '''constructor call''' is now set to 10.  
  
 
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| 05:55
 
| 05:55
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|When I Step Over again, we can see that '''this.variable''' is also set to 10.  
+
|When I '''Step Over''' again, we can see that '''this.variable''' is also set to 10.  
  
 
|-
 
|-
 
| 06:03
 
| 06:03
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|To get out of this function I can either choose '''Continue, Step Over or Step Out.'''  
+
|To get out of this function, I can either choose '''Continue, Step Over''' or '''Step Out.'''  
  
 
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|-
 
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| 06:14
 
| 06:14
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|And now I'm back to where the function call was made.  
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|And now I'm back to where the '''function call''' was made.  
  
 
|-
 
|-
 
| 06:19
 
| 06:19
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|When I say '''Step-Over''' again, you will notice that '''aSample.value''' is now set to10.   
+
|When I say '''Step-Over''' again, you will notice that '''aSample.value''' is now set to 10.   
  
 
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| 06:30
 
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| Apart from Breakpoints and StepOvers, you can also stop the execution of the program at the line of the cursor.  
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| Apart from '''Breakpoint'''s and '''Step Over'''s, you can also stop the execution of the program at the line of the cursor.  
  
 
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|You can see that it has computed the value of b, as 20.  
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|You can see that it has computed the value of 'b' as 20.  
  
 
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| 07:10
 
| 07:10
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|And inside the variable window, it has set 'b' to be 20.  
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|And inside the '''Variable''' window, it has set 'b' to be 20.  
  
 
|-
 
|-
 
| 07:14
 
| 07:14
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|Now, I can choose '''Step Over''' again and d's value also gets initialized and becomes 15.  
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|Now, I can choose '''Step Over''' again and '''d''''s value also gets initialized and becomes 15.  
  
 
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|We can now check it in the variable window or hover on the variable to check it's value.  
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|We can now check it in the '''Variable''' window or hover on the variable to check it's value.  
  
 
|-
 
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| 08:03
 
| 08:03
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|Now if you want to stop the '''debugging''' session, you can choose the '''Finish Debugger Session''' option from the toolbar.  
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|Now, if you want to stop the debugging session, you can choose the '''Finish Debugger Session''' option from the toolbar.  
  
 
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| 08:12
 
| 08:12
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|If you want to continue the execution to the next breakpoint you can choose the '''Continue''' option.  
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|If you want to continue the execution to the next breakpoint, you can choose the '''Continue''' option.  
 
   
 
   
 
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|In the Output window, it shows me the output as: ''' b '''is 20 and '''c''' is 15.  
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|In the '''Output''' window, it shows me the output as: '''b'''is 20 and '''c''' is 15.  
  
 
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| 08:34
 
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|Now, this was a quick overview of the options of '''debugging''' on '''netbeans. '''
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|Now, this was a quick overview of the options of debugging on '''netbeans. '''
  
 
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|Here you can change settings for multi-threaded program breakpoint options.
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|Here, you can change settings for multi-threaded program breakpoint options.
  
 
|-
 
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| 08:59
 
| 08:59
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|Or have filters to decide on which methods you would want to step in.  
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|Or have '''filter'''s to decide on which methods you would want to step in.  
  
 
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| 09:07
 
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|Now to the assignment.
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|Now to the assignment..
  
 
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| 09:20
 
| 09:20
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|Set breakpoints in the code. Usually, you would set a break at the calling point of a function which you suspect has the error.  
+
|Set '''breakpoint'''s in the code. Usually, you would set a break at the calling point of a function which you suspect has the error.  
  
 
|-
 
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| 09:29
 
| 09:29
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|Use '''Step-Into''' to go into the function.  
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|Use '''Step Into''' to go into the function.  
  
 
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| 09:32
 
| 09:32
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|Use '''Step-Overs''' to execute the lines and make sure to inspect the values of variables in the variable window.  
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|Use '''Step Over'''s to execute the lines and make sure to inspect the values of variables in the '''Variable''' window.  
  
 
|-
 
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| 09:41
 
| 09:41
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|Add some watches to help you identify and correct the error.  
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|Add some '''watch'''es to help you identify and correct the '''error'''.  
  
 
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|Step-Out of the method.  
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|Step Out of the method.  
  
 
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|And finally, Finish the '''debugger''' session and Run your application.  
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|And finally, Finish the '''debugger''' session and '''run''' your application.  
  
 
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| 09:57
 
| 09:57
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|In this tutorial, we became familiar with the '''netbeans debugger. '''
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|In this tutorial, we became familiar with the '''Netbeans Debugger. '''
  
 
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|Add expressions which we want to evaluate, while the code is running.  
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|Add expressions which we want to evaluate while the code is running.  
  
 
|-
 
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| 10:11
 
| 10:11
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|Trace execution of a program with '''Step-Into, Step-Over, Step-Out and Run-to-Cursor''' options.  
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|Trace execution of a program with '''Step-Into, Step-Over, Step-Out''' and '''Run-to-Cursor''' options.  
  
 
|-
 
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| 10:19
 
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|Also saw how to configure the '''debugger''' for advanced '''debugging.'''
+
|Also saw how to configure the '''debugger''' for advanced debugging.  
  
 
|-
 
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|10:24
 
|10:24
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|Hope this tutorial saves you a lot of time in your testing and '''debugging''' tasks.  
+
|Hope this tutorial saves you a lot of time in your testing and debugging tasks.  
  
 
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|10:36
 
|10:36
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|If you do not have good bandwidth, you can download and watch it
+
|If you do not have good bandwidth, you can download and watch it.
  
 
|-
 
|-
 
| 10:41
 
| 10:41
−
|The Spoken Tutorial project team conduct workshops using Spoken Tutorials.  
+
|The Spoken Tutorial project team: * conduct workshops using Spoken Tutorials.  
  
 
|-
 
|-
 
| 10:46
 
| 10:46
−
|Gives certificates to those who pass an online test.  
+
|* Gives certificates to those who pass an online test.  
  
 
|-
 
|-
 
| 10:49
 
| 10:49
−
|For more details contact contact@spoken-tutorial.org
+
|For more details, contact:
 +
contact@spoken-tutorial.org
  
 
|-
 
|-
 
| 10:55
 
| 10:55
−
|Spoken Tutorial Project is a part of the Talk to a Teacher Project
+
|'''Spoken Tutorial''' project is a part of the '''Talk to a Teacher''' project.
  
 
|-
 
|-
 
| 10:59
 
| 10:59
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| It is Supported by the National Mission on education through ICT, MHRD, Government  of India
+
| It is Supported by the National Mission on education through ICT, MHRD, Government  of India.
  
 
|-
 
|-
 
| 11:05
 
| 11:05
−
|More information on this mission is available at spoken-tutorial.org/NMEICT-Intro
+
|More information on this mission is available at:
 +
spoken-tutorial.org/NMEICT-Intro.
  
 
|-
 
|-
 
| 11:14
 
| 11:14
−
|This tutorial has been  contributed by IT for Change  
+
|This tutorial has been  contributed by '''IT for Change'''.
  
 
|-
 
|-
 
| 11:18
 
| 11:18
 
|Thank you for joining us.
 
|Thank you for joining us.

Revision as of 19:25, 26 October 2015

Time Narration
00:01 Hi everyone.
00:02 Welcome to the tutorial on Netbeans Debugger.
00:06 If this is the first time you are using Netbeans, please view the earlier tutorials on the Spoken Tutorial website.
00:14 For this demonstration, I am using the Linux Operating System Ubuntu v12.04
00:21 and Netbeans IDE v7.1.1.
00:26 We all know that debugging programs can be a rather painstaking task.
00:31 Hence, knowing a debugging tool and being familiar with its features can help you save valuable time.
00:39 This powerful debugging tool is very useful,
00:42 especially when you have to code or test large programs.
00:46 In this tutorial, we will learn some of the features that the Netbeans Debugger provides.
00:53 This tutorial will acquaint you with-
00:55 * the debugging window
00:58 * configuring breakpoints
01:00 * evaluating expressions or setting watches
01:04 * options for tracing the execution of your program and
01:17 * options to configure the debugger itself.
01:12 Now, Let's get started and debug this sample code.
01:17 I will switch to the Netbeans IDE.
01:20 I have already created a Java Application, "sampleDebug", in my IDE for this demonstration.
01:27 This is a small program that initializes three integer values 'a', 'b', and 'c'.
01:35 Then it prints 'Hello World!' and the value of 'a'.
01:40 It also creates a class object 'SampleClass' which has a 'value' integer, as a private integer value.
01:52 Then, it computes the value of 'b'
01:55 and calls a function to compute the value of 'c',
02:00 and prints the values of 'b' and 'c'.
02:05 To start with the debugging, let us first set the break-point.
02:09 To set a break point, click on the line number.
02:13 I will set at this line which prints Hello World!
02:18 Notice that the line at which a break-point is set, changes it's colour to pink and is marked by a small square against its line number.
02:28 When you run the program in the debugging mode,
02:31 by clicking on the Debug Project button in the toolbar,
02:35 the execution of the program stops at the line at which the breakpoint is located.
02:41 So far, a's value has been set.
02:45 Hover on it to check it's value.
02:49 It indicates that it's value is 10.
02:52 You can see that there are some additional windows below the workspace.
02:59 There is a 'Variables' window that shows a list of variables and their values.
03:07 So far, only the variable 'a' has been initialized.
03:11 We can also look at the 'Output' window with the sample debug output.
03:17 There is no output yet.
03:19 There is also a Debugger Console that says that the program hit a breakpoint on line 29 and has stopped there.
03:28 There is also a Breakpoints window that tells you that a breakpoint has been set on line number 29.
03:36 Before proceeding, let us see how to add a watch.
03:40 For example, let us say I want to watch on the integer value 'aSample'.
03:48 In the 'Variables' window below the workspace, I will double-click on the Enter new Watch option and enter the name of the variable "aSample.value".
04:02 Click on OK.
04:06 So far, 'aSample' has not been created. So, it says it does not know the value.
04:12 Once it executes the line, we'll know what the variable contains.
04:16 In a similar way you can also watch and evaluate expressions.
04:21 Here I'm checking for b=a+10.
04:25 What if I wanted to know what 'a-4' is.
04:29 So, let me go to the Debug menu in the menu bar and select Evaluate expression option.
04:37 The 'Evaluate Code' window appears in the workspace.
04:41 Here, I will enter the expression 'a-4'.
04:45 Click on the Evaluate Expression button here and in the Variable window, it says (a-4)'s value is 6.
04:56 Let us now proceed and execute this single line of code.
05:00 To do that, choose the Step-Over button from the toolbar.
05:06 That should execute only that 1 single line of the code to print “Hello World”.
05:12 To see the output, go to the output window and choose the sampleDebug output window
05:17 that says, Hello World! 'a' is 10.
05:22 The program has now stopped at the line to create a SampleClass object.
05:28 Now, I want to go into the constructor of the SampleClass.
05:32 To do that, I can choose the Step Into option from the toolbar.
05:41 Then I can choose Step Over and see that the value came inside the constructor call is now set to 10.
05:51 You can also check that by hovering on the variable.
05:55 When I Step Over again, we can see that this.variable is also set to 10.
06:03 To get out of this function, I can either choose Continue, Step Over or Step Out.
06:11 Let me choose Step-Out to come out of the method.
06:14 And now I'm back to where the function call was made.
06:19 When I say Step-Over again, you will notice that aSample.value is now set to 10.
06:27 This is what we were watching for.
06:30 Apart from Breakpoints and Step Overs, you can also stop the execution of the program at the line of the cursor.
06:38 For example, let me go into the function here and set the cursor to be on this line which says d=b-5; .
06:49 Now from the toolbar, choose the Run To Cursor option.
06:54 You will notice that the execution of the program gets into the function and stops at the line where the cursor is located.
07:05 You can see that it has computed the value of 'b' as 20.
07:10 And inside the Variable window, it has set 'b' to be 20.
07:14 Now, I can choose Step Over again and d's value also gets initialized and becomes 15.
07:23 Now, I can either choose to return or completely finish the execution of the program.
07:29 Let me choose Step Out and come back to the function call.
07:36 When you hover on the getC() function, you'll notice that the function has returned a value of 15.
07:43 The variable 'c' has not yet been assigned that value.
07:47 So, when we Step Over and execute that line, 'c' will get a value of 15.
07:55 We can now check it in the Variable window or hover on the variable to check it's value.
08:03 Now, if you want to stop the debugging session, you can choose the Finish Debugger Session option from the toolbar.
08:12 If you want to continue the execution to the next breakpoint, you can choose the Continue option.
08:19 Once you finish, you can also choose the Continue option to complete the execution of the remaining program.
08:25 Let me choose Continue here.
08:27 In the Output window, it shows me the output as: bis 20 and c is 15.
08:34 Now, this was a quick overview of the options of debugging on netbeans.
08:39 If you want any advanced feature settings, you can -
08:42 Go to Tools menu, click on Options, go to Miscellaneous option, click on the Java Debugger tab.
08:53 Here, you can change settings for multi-threaded program breakpoint options.
08:59 Or have filters to decide on which methods you would want to step in.
09:07 Now to the assignment..
09:09 As an assignment, take any of your programs, excellent if it has already errors.
09:16 If not, introduce some errors with the logic or algorithm.
09:20 Set breakpoints in the code. Usually, you would set a break at the calling point of a function which you suspect has the error.
09:29 Use Step Into to go into the function.
09:32 Use Step Overs to execute the lines and make sure to inspect the values of variables in the Variable window.
09:41 Add some watches to help you identify and correct the error.
09:45 Step Out of the method.
09:48 Continue till you reach the next breakpoint.
09:51 And finally, Finish the debugger session and run your application.
09:57 In this tutorial, we became familiar with the Netbeans Debugger.
10:02 We saw how to set breakpoints and watches.
10:06 Add expressions which we want to evaluate while the code is running.
10:11 Trace execution of a program with Step-Into, Step-Over, Step-Out and Run-to-Cursor options.
10:19 Also saw how to configure the debugger for advanced debugging.
10:24 Hope this tutorial saves you a lot of time in your testing and debugging tasks.
10:30 Watch the video available at the link shown on the screen.
10:33 It summarizes the Spoken Tutorial project.
10:36 If you do not have good bandwidth, you can download and watch it.
10:41 The Spoken Tutorial project team: * conduct workshops using Spoken Tutorials.
10:46 * Gives certificates to those who pass an online test.
10:49 For more details, contact:

contact@spoken-tutorial.org

10:55 Spoken Tutorial project is a part of the Talk to a Teacher project.
10:59 It is Supported by the National Mission on education through ICT, MHRD, Government of India.
11:05 More information on this mission is available at:

spoken-tutorial.org/NMEICT-Intro.

11:14 This tutorial has been contributed by IT for Change.
11:18 Thank you for joining us.

Contributors and Content Editors

PoojaMoolya, Pratik kamble, Sandhya.np14

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