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2017-05-05T06:24:51Z

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{| style="border-spacing:0;"
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| <center>'''Visual Cue'''</center>
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| <center>'''Narration'''</center>

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| '''Slide 1'''

'''Exception Handling'''
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Welcome to the spoken tutorial on''' Exception Handling.'''

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| '''Slide 2'''

'''Learning Objectives'''

* What is an '''Exception'''
* '''Checked '''and '''Unchecked Exceptions '''
* Handling the '''Exceptions''' using
'''try-catch''' '''block'''
'''finally block '''

| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| In this tutorial we will learn about:

* What is an '''exception'''
* '''Checked '''and '''unchecked exceptions '''
* Handling the '''exceptions''' using
'''try-catch''' '''block '''and
'''finally block '''

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| '''Slide 3'''

'''Software Requirements'''

* '''Ubuntu '''16.04 OS
* '''JDK 1''' .8
* '''Eclipse''' 4.3.1

| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Here we are using

* '''Ubuntu Linux 16.04 OS'''
* '''JDK 1 .8 '''and
* '''Eclipse 4.3.1'''

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| '''Slide 4'''

'''Prerequisites'''

* Basic knowledge of '''Java''' and '''Eclipse IDE'''
* For relevant tutorials, please visit http://www.spoken-tutorial.org

| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| To follow this tutorial, you must have knowledge of basics of''' Java''' and''' Eclipse IDE.'''

If not, for relevant''' Java '''tutorials, please visit the link shown.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| '''Slide 5(a)'''

'''Exceptions'''

* An '''exception '''is an unexpected event, which occurs during the execution
* It interrupts the normal flow and results in an abnormal termination.
* Exceptions are classified as
* '''unchecked''' exceptions and
* '''checked''' exceptions.

| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| An '''exception''' is an unexpected event, which occurs during the execution of a program.

It interrupts the normal flow of the

program and results in an abnormal termination.

Based on their occurrence, '''exceptions''' are classified as

* '''unchecked''' exceptions and
* '''checked''' exceptions.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| In Eclipse IDE, create a project called Exception'''Demo'''
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Now we will open''' eclipse''' and create a new project called '''ExceptionDemo.'''

Inside this project we will create the necessary classes to demonstrate '''exception handling.'''

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Right click on '''src''' folder and right-click '''New'''-> '''Class '''and type the class name as '''Marks''' and hit '''Enter'''
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| We will create a new '''class Marks.'''

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| //Copy and paste the code.

'''public''' '''static''' '''void''' main(String[] args) {

'''int'''[] marks={30,40,35,34,45};

'''int''' a=0;

System.''out''.println("Mark List");

'''for'''('''int''' i=0;i<5;i++){

System.''out''.println(marks[i]);

}}
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Now type the following code to represent the '''Marks '''class.

This program prints the marks of 5 students that is stored in an array '''marks'''.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Click on '''run''' icon

Highlight the output
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Let us run this program and verify the output.

We can see that the values in the array are getting printed.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Type the following code (before printing the array)

System.''out''.println("\t"+marks[50]);

Highlight the index 50
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Let us check what will happen if we are trying to access an array element which is not existing.

Now type the following code.

We know that there are only 5 elements in our array.

But in this statement we are trying to access the element at index 50 which is not existing.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Click on run icon

Highlight the error Message

ArrayIndexOutOfBoundsException and

at Marks.main(<u>Marks.java:7</u>)

Highlight the print statement
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Let us run this program now.

We can see that the program terminates with an error message:

“'''ArrayIndexOutOfBoundsException''' “at line number 7.

The error message indicates the details of the exception like

* type of '''exception'''
* where it occurred and other details.

Note that the print statement is not executed as the program terminates after the error.

This is an example of '''Unchecked''' exception.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| '''Slide 7'''

'''Unchecked Exception'''

* '''Unchecked Exceptions''' are called as '''Runtime Exceptions'''

* They handle the programming bugs and logical errors such as

*
Dividing a number by zero
Accessing an array element which is not existing

| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| * '''Unchecked exceptions''' are called as '''Runtime exception''' as it is checked only during the execution.

* They handle the programming bugs and logical errors such as

*
Dividing a number by zero and
Accessing an array element which is not existing

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"|
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Now let us learn about how to handle an '''exception '''using''' try catch block'''.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| '''Slide 8'''

'''Handling Exceptions'''

Highlight the portion of the code which can raise the exception

Highlight '''Exception e'''

Highlight the portion of code inside '''catch block'''
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| This portion of the code within a '''try block''', can possibly raise an '''exception. '''

The corresponding '''catch block''' can receive the '''exception''' details in object '''e.'''

Inside the '''catch block''' we can write the code for

* displaying error messages or
* recovering from the error

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Switch to eclipse
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Now let us switch to eclipse.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Type the code to add try block

'''try'''{

System.''out''.println("\t"+marks[50]);

}
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| First let us add a '''try block '''around the code which caused the '''exception''' like this.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Copy the following code

'''catch'''(ArrayIndexOutOfBoundsException e)

{

System.''out''.println("Array Overflow Exception occurred");

}

Highlight "Array Overflow Exception occurred"

Highlight the Exception object e

| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Now we have to add a corresponding '''catch block.'''

So type the following code.

Here we are printing a custom message “Array Overflow Exception occurred”

Inside the round brackets we have created an instance of '''ArrayIndexOutOfBoundsException. '''

So this block can catch '''exceptions''' of type '''ArrayIndexOutOfBoundsException.'''

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Click on '''run''' icon

Highlight the output ie Printing the array
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Now let us run the program.

We can see that the error message gets printed.

But this time, note that printing the marks array is also executed.

In this way we can handle exceptions.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"|
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Next let us see how to use multiple '''catch blocks.'''

We can use them''' '''when different types of '''exceptions''' are raised by a block.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Insert the following code inside the try block (before the line of code System.''out''.println("\t"+marks[50]);)

System.''out''.println(marks[2]/a);

Highlight the above line of code
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Type the following code inside the '''try block'''.

This line of code divides an array element by zero as the value of '''a '''is '''zero'''.

So an '''ArithmeticException''' will be raised first.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Type the following code

'''catch'''(ArithmeticException e)

{

System.''out''.println("Arithmetic Exception occurred");

}
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Let us now add one more catch block to handle the '''ArithmeticException.'''

So type the following code after the existing '''catch block'''.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Click on run icon

Highlight the error message in the output

| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Let us run the program again.

This time the error message "Arithmetic Exception occurred" gets printed as it is caught first.

The remaining portion of the code outside the '''try catch block '''executes.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| '''Slide 9'''

'''Checked Exceptions'''

* They are checked at compile time.
* They must be handled before running the program

Example:

* Accessing a '''File''' which is not existing
* Accessing a '''Network System''' when the network is down

| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Next let us see about '''checked exceptions'''.

'''Checked''' '''exceptions''' are checked at compile time.

So they must be handled before running the program.

For example:

* Accessing a '''file''' which is not existing or
* Accessing a '''network system''' when the network is down

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| switch to Eclipse, create a new '''class MarksFile'''
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Now let us switch to '''Eclipse''' and create a new '''class MarksFile. '''

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Type main and press control+space
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Let us add '''main''' method.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Type the following code

FileReader fr='''null'''<nowiki>;</nowiki>

Highlight FileReader fr='''null'''<nowiki>;</nowiki>

Highlight FileReader
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Now we want to read a file located in the computer.

So type the following code'''.'''

Here the '''FileReader''' object '''fr '''is initialized as '''null'''.

'''FileReade'''r object can be used to access and read a particular file.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Point the error

Click on the error and import the class

Go to the top of the code file and highlight the import statement
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| '''Eclipse''' will show an error.

To rectify the error, click on it and double click '''import FileReader java dot io.'''

The '''FileReader class''' is imported from the '''java dot io package.'''

We will learn about '''package''' and its usage in detail in a later tutorial.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Type the following code

fr = new FileReader("/home/spoken/Marks");

Highlight "/home/spoken/Marks

Point the error

| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| To allow '''fr '''to access a file called''' Marks''' which is located in the home folder, type the following code.

The path shown here is to be replaced with that of your system's home folder.

Now an error comes up. It indicates that this line of code can create a '''FileNotFoundException.'''

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Click on the error and double click '''Surround with a try catch block.'''

| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Click on the error and double click '''Surround with try/catch'''.

We can see that eclipse automatically inserts the '''try catch block''' to rectify this error.

So we can understand that this is a '''checked exception'''.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Go to the '''MarksFile''' class
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Next let us see how to use '''finally block.'''

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Copy the following code

'''finally'''{

System.''out''.println("Inside finally block");

'''}'''
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Type the following code.

'''finally block''' usually follows a '''try-catch block .'''

The code inside this block is executed whether exception has occurred or not.

It contains a print statement.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Type fr.close();

| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Now let us close the file reference inside the '''finally block.'''

So type, fr dot close

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Point the error

Click on the error and double click '''Surround with try/catch '''
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Now eclipse indicates that this will raise an '''IOException.'''

So click on the error and double click '''Surround with try/catch'''.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Click on '''run''' icon
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Now let us run the program.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Highlight '''FileNotFound Exception'''

Highlight '''NullPointerException'''

Highlight the print statement

Inside finally block
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| We can see that''' FileNotFoundException''' message is printed.

This is because we don't have a file named '''Marks''' in our home folder.

We can also see a '''NullPointerException '''as '''fr '''still refers to a null value.

But we can see that the print statement inside '''finally block''' gets executed.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| So click on '''Files''' in the '''Ubuntu desktop''' and go inside the''' home folder'''
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Let us now create a text file '''Marks''' in our home folder.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| In the eclipse show the path

D:\\Marks.txt
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| If you are a windows user, create a text file in your local drive and mention its path.

For example it can be specified as '''D:\\Marks.txt'''

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Click on '''run''' icon
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Let us now run the program again.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| Highlight the output

Inside finally block
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| We can verify that there are no exceptions once the '''Marks''' file is created.

And '''“Inside finally block”''' gets printed.

The cleanup operation i.e closing the '''FileReader''' Object '''fr '''is also executed successfully.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"|
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| With this we come to the end of this tutorial.

Let us summarize.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| '''Slide 10'''

'''Summary'''

* What is an '''Exception'''
* '''Checked '''and '''Unchecked Exceptions '''
* Handling the '''Exceptions''' using
'''try-catch''' '''block'''
f'''inally block '''

| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| In this tutorial we have learnt about

* What is an '''exception'''
* '''Checked '''and '''unchecked exceptions '''
* Handling the exceptions using the
'''try-catch''' '''block '''and
f'''inally block '''

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| '''Slide 10'''

'''Assignment'''

Learn about another '''Runtime Exception''' called '''NullPointerException '''

Refer to the java program named '''Demo.java '''provided in the assignment section.

An exception will be raised when you run this code.

Identify the code which is responsible for the exception.

Rectify it using a''' try-catch block'''

| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| As an assignment,

Learn about another '''Runtime Exception''' called '''NullPointerException. '''

Refer to the Java program named '''Demo.java '''provided in the '''Assignment''' link of this tutorial.

An exception will be raised when you run this code.

Identify the code which is responsible for the exception.

Rectify it using a''' try-catch block.'''

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| '''About Project'''

(retain the slide as in TEX file)
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| The video at the following link summarizes the''' Spoken Tutorial Project.'''

Please download and watch it.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| '''About Workshops'''

(retain the slide as in TEX file)
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| The''' Spoken Tutorial Project Team'''

• Conducts workshops using spoken tutorials

• Gives certificates on passing the online tests

For more details, please write to us.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| '''About NMEICT'''

(retain the slide as in TEX file)
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.155cm;padding-right:0.191cm;"| '''Spoken Tutorial Project''' is funded by the NMEICT, MHRD, Government of India.

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@@ Line 593: / Line 593: @@
 * Handling the '''Exceptions''' using
 ** '''try-catch''' '''block'''
-** f'''inally block '''
+** '''finally block '''
@@ Line 602: / Line 602: @@
 * Handling the exceptions using the
 ** '''try-catch''' '''block '''and
-** f'''inally block '''
+** '''finally block '''

Java/C3/Exception-Handling/English - Revision history

Nancyvarkey at 09:45, 9 May 2017

Priyacst at 06:25, 5 May 2017