Priyacst: Created page with "'''Title of script:''' Java Interfaces '''Author:''' Joms Antony '''Keywords:''' Java Interfaces, Implementation Classes, implements keyword, abstract method, video tutorial..."

2015-12-29T09:40:50Z

Created page with "'''Title of script:''' Java Interfaces '''Author:''' Joms Antony '''Keywords:''' Java Interfaces, Implementation Classes, implements keyword, abstract method, video tutorial..."

New page

'''Title of script:''' Java Interfaces

'''Author:''' Joms Antony

'''Keywords:''' Java Interfaces, Implementation Classes, implements keyword, abstract method, video tutorial, Java tutorial

{| style="border-spacing:0;"
| style="background-color:#ffffff;border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>'''Visual Cue'''</center>
| style="background-color:#ffffff;border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>'''Narration'''</center>

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Slide 1:'''
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Welcome to the''' Spoken Tutorial''' on''' Java Interfaces.'''

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Slide 2:'''

'''Learning Objectives'''

| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| In this tutorial we will learn about:

* Creating an''' interface'''
* Creating an''' Implementation class''' and
* Usage of''' Interfaces'''

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Slide 3:'''

'''Software Requirements'''

| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| For this tutorial, I am using

* '''Ubuntu 12.04'''
* '''JDK 1.7 '''and
* '''Eclipse 4.3.1'''

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Slide 4:'''

'''Prerequisites'''

| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| To follow this tutorial, you should have knowledge of basics of''' Java''' and''' Eclipse IDE.'''

You should also have the knowledge of''' subclassing''' and''' Abstract classes '''in''' Java.'''

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

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"|
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| First let's understand what is an '''interface'''.

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Slide 5:'''

'''What is an interface?'''
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| An''' Interface''' contains a set of''' abstract'''

'''methods''' and''' static data members'''.

It defines the signatures of

a set of''' methods,''' without the body.

It is declared using the

'''interface''' keyword.

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Slide 6:'''

'''Implementing the interface'''

| style="background-color:#ffffff;border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| A''' class''' can implement an''' interface'''

using the''' implements''' keyword.

A''' class''' can implement more than one

'''interface.'''

All the''' abstract methods''' defined in the''' interface''' or''' interfaces''' must be implemented in such '''classes'''.

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"|
| style="background-color:#ffffff;border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Now let us explore the differences between an''' interface''' and an''' abstract''' class.

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Slide 7:'''

'''Interface Vs Abstract Classes'''
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| All the methods in an''' interface''' should

be''' abstract.'''

Within''' interface''' there should not be any

* '''constructors'''
* '''concrete methods'''
* '''static methods '''and
* '''main method'''

But an''' abstract''' class can have all these inside it.

The variables in an''' interface''' should

be''' static''' and''' final.'''

There are no such restrictions for an''' abstract''' class.

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"|
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Next we will see an example for an '''interface'''.

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Slide 8:'''

'''Interface:'''

'''Example:'''

Highlight the''' methods'''

| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Here the interface name is''' Animal.'''

It contains three '''abstract''' methods''' talk(), see()''' and''' move().'''

All such '''methods''' in an '''interface''' are implicitly''' public''' and''' abstract'''.

An''' interface''' can also contain constant variable declarations.

Here, the constant string value''' “Mammal”''' is assigned to the variable''' “type1”'''.

And''' “Reptiles”''' is assigned to the variable''' “type2”'''.

All''' constant values''' defined in an''' interface''' are implicitly''' public, static''' and''' final.'''

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"|
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Next we will see how to create an '''implementation class''' for an''' interface''' with an example.

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Slide 9:'''

'''Implementation class:'''

'''Example:'''
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Here''' Human''' is a''' class''' which implements the''' Animal interface.'''

So it must provide implementations for the '''methods talk(), see()''' and''' move().'''

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Slide 10:'''

'''Implementing multiple interfaces'''

'''Example:'''

Highlight the''' syntax''' and the usage of''' comma operator'''
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| A '''class''' can also implement''' multiple interfaces'''.

As shown in the example, the''' class Human '''implements two''' interfaces Animal''' and''' Action.'''

Note that a''' comma operator''' used in the syntax is to identify the different''' interfaces.'''

Now this''' class''' should provide implementations to all the''' abstract methods''' in both''' Animal''' and''' Action interfaces.'''

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Slide 11:'''

'''Interface Usage - Example'''
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| The figure here represents an implements relation.

The''' Animal class''' is an''' interface.'''

The''' Human '''and''' Snake classes''' are the two '''implementation classes'''.

The '''Human class''' provides its own different implementations for''' talk()''',''' see()''' and''' move() methods.'''

And the '''Snake class''' provides its own different implementations for''' talk()''',''' see()''' and''' move() methods.'''

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"|
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Let us understand the usage of '''interfaces '''with a sample program.

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| In Ecilpse IDE a project called Interface'''Demo''' is created,

| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Now we will switch to''' Eclipse''' and create a new project called''' InterfaceDemo'''.

Here we will create the necessary''' classes''' and''' interface''' to demonstrate the usage of''' interfaces.'''

|-
| style="background-color:#ffffff;border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| The''' interface Animal''' is created in the''' src''' folder.

Code is copied
| style="background-color:#ffffff;border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Now, right click on''' src''' folder and click''' new-'''>''' interface'''.

Type the name as''' Animal''' and press '''Enter'''.

Note that''' '''the '''“interface”''' keyword is used for defining an '''interface'''.

Now type the code as displayed on the screen.

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"|
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Next let us create the''' implementation classes.'''

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Right click on the '''default package''' and create a''' class''' called''' Human.'''

Type''' implements Animal'''
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Right click on the '''default package '''and create a''' class''' called''' Human.'''

Now to make this an implementation class of''' Animal, '''type''' implements Animal.'''

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Point to the error message
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Now we can see an error comes up in the''' Eclipse IDE.'''

This error indicates that, we should provide an implementations to the '''Animal interface.'''

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"|
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Let us see how to rectify this error.

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| public void talk(){

System.out.println("I am a Human, I belong to the "+Animal.type1+" Family");

}

public void see(){

System.out.println("I CAN SEE ALL COLORS ");

}

public void move(){

System.out.println("I MOVE BY WALKING");

}
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Now let us define the''' methods talk(), see()''' and''' move().'''

So type''' public void talk( )'''

within curly brackets type

'''System.''out''.println''' within quotes''' I am a human and I belong to'''

Now we can use the value of the''' static, final variable type1''' declared in the''' Animal interface'''

So type

'''+ Animal.type1+''' within quotes''' family '''semicolon'''.'''

Let us now implement the '''see()''' method

So type''' public void see( )'''

within curly brackets type

'''System.''out''.println''' within quotes''' I can see all colors''' semicolon

We should also define the''' move()''' method

So type''' public void move( )'''

within curly brackets type

'''System.''out''.println''' within quotes''' I move by walking''' semicolon

Note that the error disappears, once all the methods are implemented.

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"|
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Next we will see how to define the''' Snake class.'''

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Show and highlight the code for Snake Class.
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| I have already created it in my project.

Please create the '''snake''' class in your project and type the following code as displayed on the screen.

Now let us go through the code.

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Highlight the code'''

public void talk(){

System.out.println("I am a Snake, I belong to the "+Animal.type2+" Family");

}

public void see(){

System.out.println("I CAN SEE ONLY IN BLACK AND WHITE");

}

public void move(){

System.out.println("I MOVE BY CRAWLING");

}
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| We can see that all the methods of the''' Animal interface talk()''' ,''' see()''' and''' move()''' are implemented inside this class.

Here the''' talk() method''' prints “'''I am a snake and I belong to'''

Then the value of''' Animal.type2''' is to be printed and then''' “family”'''

Here the''' see() method''' prints “'''I can see only in black and white”'''

The''' move() method''' prints''' "I move by crawling"'''

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Highlight the''' talk(), see()''' and''' move()''' methods of''' Human class'''

Highlight the''' talk(), see()''' and''' move()''' methods of''' Snake class'''
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Note that the''' Human''' class has its own implementations of''' talk(), see()''' and''' move()''' methods.

And the''' Snake''' class has its own implementations of''' talk(), see()''' and''' move()''' methods

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| click new-> class and then type name as''' Demo'''.
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Now right click on the '''default package''' click''' new'''->''' class''' and then type name as''' Demo.'''

Inside this class we will have the''' main method''',

So type''' main''' and then press ctrl+space to generate the''' main method.'''

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Highlight the code line by line

Highlight the second line

Animal h=new Human();

h.talk()

h.see();

h.move();

| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Type the following code as displayed on the screen.

In this line, we

instantiate the''' Human class''' using the''' Animal interface.'''

This is represented as

'''Animal h''' equals''' new Human()'''<nowiki>;.</nowiki>

Now we can invoke the different methods using this object as

'''h.talk()'''

'''h.see();'''

'''h.move();'''

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Highlight the code

Animal s =new Snake();

s.talk();

s.see();

s.move();
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Next, we instantiate the''' Snake class''' using the''' Animal interface.'''

This is represented as

'''Animal s''' equals''' new Snake().'''

Now we can invoke the different methods using this object as

'''s.talk();'''

'''s.see();'''

'''s.move();'''

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"|
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Now let us run this''' Demo''' program.

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Right click on the'' class'' Demo and then select''' Run as''' ->''' Java Application'''
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| So right click on the'' '''''class Demo''' and then select''' Run as''' ->''' Java Application.'''

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Highlight code and the output
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| We can see the output as

'''I am a human and I belong to Mammal family'''

'''I can see all colors''' and

'''I move by walking'''

These are printed by the''' talk(), see()''' and''' move() methods''' invoked using the''' Human class object h.'''

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Highlight code and the output
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| We can also see in the output

'''I am a snake and I belong to Reptiles family'''

'''I can see only in black and white'''

and '''I move by crawling'''

These are printed by the''' talk(), see()''' and''' move() methods''' invoked using the''' Snake class object s.'''

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"|
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| This brings us to the end of this tutorial. Let us summarize.

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Slide 10:'''

'''Summary'''
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| In this tutorial we have learnt about

* Creating an''' Interface'''
* Creating an''' implementation class '''and
* Usage of''' interfaces'''

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Slide 11:'''

'''Assignment'''
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| As an''' assignment'''

Create an '''interface Vehicle''' which

contains the methods''' brake()''' and''' run().'''

Create another '''interface Fuel''' which

contains the following methods.

'''fill(String type, int quantity)'''

'''pay(int quantity, int price)'''

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Assignment'''
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Create a subclass''' Car''' which implements both the '''interfaces Vehicle''' and''' Fuel.'''

Here''' brake method''' should print''' ”Car'''

'''Applies Power brake”''' and the '''run'''

'''method''' should print''' ”Car is running on 4'''

'''wheels”.'''

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Assignment'''
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Similarly''' fill() method''' can print the

the type and quantity of the fuel

filled.

For example: 10 Litres of Petrol

'''pay() method''' can be used to print

the price to be paid.

For example: Pay Rs.640

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Assignment'''
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Create another subclass''' Bike''' which

again implements both the '''interfaces'''

'''Vehicle''' and''' Fuel.'''

Here '''brake method''' can print ”'''Bike'''

'''Applies hand brake”''' and the '''run'''

'''method''' can print “'''Bike is running on'''

'''2 wheels”'''

|-
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"|
| style="border-top:none;border-bottom:1pt solid #000000;border-left:1pt solid #000000;border-right:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Next, implement the '''fill()''' and '''pay()''' methods as explained earlier.

Finally create a '''Demo class''' containing the '''main method''' to verify the results.

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''About Project'''

| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| The video at the following link summarizes the''' '''Spoken Tutorial Project.

Please download and watch it.

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''About Workshops'''

| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| The Spoken Tutorial Project Team

• Conducts workshops using spoken tutorials and

• Gives certificates on passing the online tests

For more details, please write to us.

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''About NMEICT'''

| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Spoken Tutorial Project is funded by NMEICT, MHRD, Government of India.

More information on this Mission is available at the link shown.

|-
| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Contributor slide'''

| style="border:1pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| This script has been contributed by:

Department of Information

Technology, Amal Jyothi College of Engineering

This is Priya from IIT Bombay signing off. Thank you for joining.

|}

Java/C3/Java-Interfaces/English - Revision history

Nancyvarkey at 07:45, 12 January 2017

Priyacst at 06:37, 12 January 2017

Nancyvarkey at 10:42, 29 December 2015

Priyacst: Created page with "'''Title of script:''' Java Interfaces '''Author:''' Joms Antony '''Keywords:''' Java Interfaces, Implementation Classes, implements keyword, abstract method, video tutorial..."