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2016-11-07T06:22:39Z

Created page with "'''Title of script:''' Static Methods '''Author:''' Joms Antony '''Keywords:''' Static methods, Class methods, Instance methods, Static variables {| style="border-spacing:..."

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'''Title of script:''' Static Methods

'''Author:''' Joms Antony

'''Keywords:''' Static methods, Class methods, Instance methods, Static variables

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

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Slide 1'''
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Welcome to the Spoken Tutorial on''' Static Methods.'''

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

'''Learning Objectives'''

* What are''' static methods'''
* Defining''' static methods'''
* Difference between''' instance methods''' and''' static methods'''
* How to use''' static methods'''

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

* What are''' static methods'''
* Defining''' static methods'''
* Difference between''' instance methods''' and''' static methods '''and
* How to use''' static methods'''

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

'''Software Requirements'''

* '''Ubuntu 14.04'''
* '''JDK 1 .7'''
* '''Eclipse 4.3.1'''

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

* '''Ubuntu 14.04'''
* '''JDK 1 .7 '''and
* '''Eclipse 4.3.1'''

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

'''Prerequisites'''

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

| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| To follow this tutorial,

You must have knowledge of basics of''' Java''' and''' Eclipse IDE.'''

You should also have the knowledge of''' instance variables, methods''' and''' static variables '''in''' Java.'''

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

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Slide 5'''

'''Static Method'''

* A''' static method''' is a method which is associated with the entire''' class'''

* It is also called a''' class method''' and is declared using the''' static keyword.'''

* '''Static methods''' are usually used to handle''' static variables'''

| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| A''' static method''' is a method which is associated with the entire''' class.'''

It is also called a''' class method''' and is declared using the''' static keyword.'''

'''Static methods''' are usually used to handle''' static variables.'''

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Slide 6'''

'''Static Method – Example'''

'''Show the final shot in the slide.'''

'''(Three students enrolled and total count as 3)'''

Highlight '''name''' and '''id'''

Highlight '''organization''' and''' total count'''

| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Let us see how to use''' static methods''' with an example'''.'''

This example is very similar to the one which is used in the '''Static Variable''' tutorial.

Here again we are representing the''' StudentEnroll''' class.

Recall that the variables''' name''' and''' id''' are handled as''' instance variables.'''

Here the variables''' organization''' and''' total count''' are common to the entire class.

So they can be treated as '''static variables'''.

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

'''Static Method'''

* Any method which is used to handle''' static variables''' can be defined as a''' static method'''
* If a''' method''' is used to change the value of''' Organisation name,''' then it can be defined as a''' static method'''

| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Any method which is used to handle''' static variables''' can be defined as a''' static method.'''

Say for example, if a''' method''' is used to change the value of''' Organisation name,''' then it can be defined as a''' static method.'''

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

'''Instance Vs Static Methods'''

* '''Instance methods''' can access''' static variables'''
* A '''Static method''' can directly access

and modify only''' static variables'''
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Now let us explore the differences between''' instance method''' and''' static method.'''

'''Instance methods''' can access''' static variables, '''whereas

A''' static method''' can directly access and modify only''' static variables.'''

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Slide 8(A)'''

* '''Instance methods''' are invoked only by an''' object'''
* A''' static method''' can be invoked

directly without creating an''' object'''
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Instance methods''' are invoked only by an''' object''' whereas

A''' static method''' can be invoked directly without creating an''' object.'''

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Slide 8(B)'''

* We cannot use''' ‘this’''' and''' ‘super’'''

keyword inside a''' static method.'''

* These keywords refer to the instance of a particular class.
* In a static context we can’t refer to instances of a class.

| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| * We cannot use''' ‘this’''' and''' ‘super’ '''keyword inside a''' static method.'''

* This is because these keywords refer to the instance of a particular class.
* In a static context we can’t refer to instances of a class.

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

'''Static Method - Sample Code'''

Highlight the code

public static void setOrgName(String org)

{

orgname=org;

}
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Now let us look at the sample code for a''' static method.'''

If the''' StudentEnroll''' class requires a method to change the value of the '''organisation name.'''

It can be defined as a''' static method''' as shown.

The''' setOrgName''' method represented here is a''' static method''' which can modify the value of''' orgname'''.

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

'''Invoking Static Methods'''

* A static method can be invoked directly by the class name itself

Highlight '''setOrgName'''

Highlight the full code
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| A '''static''' '''method''' can be invoked directly by the class name itself

For Example, the''' setOrgName''' method can be invoked as

'''StudentEnroll.setOrgName within brackets IIT Mumbai.'''

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| In Eclipse IDE, create a project '''StaticMethodDemo'''

| style="border:1pt solid #000001;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''' StaticMethodDemo'''.

Inside this project we will create the necessary classes to demonstrate the usage of''' Static methods.'''

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Right click on''' src''' folder and click '''New'''->''' Class '''and type the class name as''' StudentEnroll''' and hit '''Enter'''

| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| We will create a new''' class StudentEnroll.'''

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| //copy and paste the code inside the class and highlight them

private String id, name;

private static int count;

private static String orgname="IIT Bombay";
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Now type the following code to represent the''' StudentEnroll''' class.

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Highlight''' static int count''' and '''static String orgname'''

Highlight''' static String orgname'''

Highlight '''static String orgname="IIT Bombay";'''
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Note that there are two''' static variables count''' and''' orgname'''.

Also note that''' orgname''' is not a '''static constant''' rather it is normal '''static variable'''

The''' static variable orgname''' is initialized as''' “IIT Bombay”'''

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| click on''' Source ->''' and select''' Generate Constructor using Fields'''
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Now click on''' Source ->''' and select''' Generate Constructor using Fields'''

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Delete the''' super''' keyword
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Delete the''' super''' keyword from the generated code.

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Inside the '''constructor''', type '''count++;'''

| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Inside the '''constructor''', type

'''count ++ semicolon'''

So, the '''count''' value is incremented every time an object is created.

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Type

'''public void''' showData()

//copy the code and highlight it

{

System.''out''.println(id+" "+name+" "+''orgname'');

}
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Now we will add a method''' showData'''( ) to this class to print the values of the variables.

So type''' public void showData( ).'''

Within brackets type the following code to print the values of''' id, name''' and''' organisation name.'''

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| //copy and paste the code

public static void setOrgName(String org)

{

orgname=org;

}
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Now we will add the''' static method setOrgName''' which can change the value of''' orgname.'''

Type the following code.

We have already seen this code earlier in a slide.

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Inside this static method type

'''id = “newid”;'''
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Let us see what happens if we try to access an''' instance variable''' directly inside this''' static method.'''

Type,

'''id= “newid” semicolon'''

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Hover the cursor to show the error
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Now an error comes up in eclipse.

It indicates that an''' instance variable''' cannot be accessed directly inside a''' static method.'''

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Comment the statement
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| So let us comment this line and proceed.

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| //Copy and paste the code and highlight according to narration

public static void showOrgData()

{

System.out.println("\nORGANISATION DATA");

System.out.println("Name:"+orgname);

System.out.println("Total Students Enrolled:"+count);

}
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Now we will add one more''' static method showOrgData.'''

These statements print the values of''' orgname''' and''' count.'''

|-
| style="border:1pt solid #000001;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 #000001;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 the 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 #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''//Copy the code to create objects'''

StudentEnroll s1=new StudentEnroll("IT101","ADIL");

StudentEnroll s2=new StudentEnroll("CS101","AMAL");

StudentEnroll s3=new StudentEnroll("CS101","CAROL");

(Copy the code)

s1.showData();

s2.showData();

s3.showData();

(Copy and paste)

StudentEnroll.showOrgData();
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| We will create a few objects of''' StudentEnroll class''' to represent student enrollments.

So type the following code to create 3 objects''' s1, s2''' and''' s3.'''

Now let us invoke the''' showData''' method to print the enrollment details.

Type the following code to invoke''' showData''' method on''' s1, s2''' and''' s3.'''

Let us also invoke the method''' showOrgData''' to print the values of''' orgname''' and''' count.'''

Since it is a''' static method''' we can invoke it directly using its class name.

To do so, type this code.

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

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Highlight

'''IT101 ADIL IIT Bombay'''

Highlight '''CS101 AMAL IIT Bombay'''

'''CS101 CAROL IIT Bombay'''

Box '''IIT BOMBAY'''

Highlight '''Name:IIT Bombay'''

Highlight '''Total Students Enrolled:3'''
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| We can see that the values of the variables corresponding to''' s1''' i.e''' IT101, ADIL''' and

'''IIT BOMBAY''' gets printed.

Similarly the values corresponding to''' s2''' and''' s3''' are also printed.

Note that the value of''' orgname''' ie''' IIT BOMBAY''' is common for''' s1, s2''' and''' s3'''

'''orgname''' and''' count''' are printed separately by the static method''' showOrgData.'''

Note that the organisation name is printed as''' IIT Bombay'''.

The value of the number of student enrollments is printed as''' 3,''' as we have already created 3 objects'''.'''

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Type

StudentEnroll.setOrgName("IIT Mumbai");

(Copy the code)

s1.showData();

s2.showData();

s3.showData();

Type

StudentEnroll.showOrgData();
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Now let us invoke the static method''' setOrgName.'''

We will change the organisation name from''' “IIT Bombay”''' to''' “IIT Mumbai”'''.

So type the following code.

Now let us once again invoke the''' showData''' method on''' s1, s2''' and''' s3''' to print the enrollment details.

For that type the following code again'''.'''

Once again, let us invoke the method''' showOrgData''' to print the values of''' orgname''' and''' count.'''

To do so, type this code.

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

| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Now run the '''Demo''' program again.

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Box '''IIT Mumbai'''

| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| We can see that the organisation name is changed to''' “IIT Mumbai”.'''

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Switch to slides

| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Let us come back to slides.

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Slide 11'''

'''Passing an object reference'''

* '''Object references '''can be passed to a

static method.

* This way a''' static method''' can access

the instance variables of that particular object.
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Object references''' can be passed to a static method.

This way a''' static method''' can access the instance variables of that particular object.

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Switch to Eclipse

Go to '''StudentEnroll''' class
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Let us try it in our code.

Switch to Eclipse and go to the '''StudentEnroll''' class.

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| In the''' setOrgName''' method

After '''String org''', type

comma''' StudentEnroll s'''

uncomment''' id = "newid"'''

Type '''s.id="newid";'''
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Now in the''' setOrgName''' method, pass another argument as an''' object''' of''' StudentEnroll''' class.

So after '''String org''', type

comma''' StudentEnroll s'''

Now inside this method, uncomment''' id = "newid"'''

And instead of '''id, '''type '''s.id'''

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Go to the '''Demo''' class

| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Now go to the '''Demo''' class.

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| In the StudentEnroll.setOrgName("IIT Mumbai");

after '''“IIT Mumbai”''', type comma''' s1'''

| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Let us modify the function call to''' setOrgName method''' by passing the '''StudentEnroll''' object '''s1.'''

So here, after '''“IIT Mumbai”''', type comma''' s1.'''

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Click on '''run''' button
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Now run the '''Demo '''program again.

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Highlight id '''“newid”'''
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| We can see that the value of id for''' s1''' has changed to''' “newid”'''

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Slide 12'''

'''Summary'''

* What is a '''static method''' and when it is used
* How to differentiate '''static methods '''and '''instance methods'''
* How to create and invoke '''static methods'''

| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Let us summarize.

In this tutorial we have learnt about

* What is a '''static method''' and when it is used
* How to differentiate '''static methods '''and '''instance methods''' and
* How to create and invoke '''static methods'''

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Slide 13'''

* Design a class CarService to represent

a Car Service Station

* This class should contain variables to

represent the following

* Name of the Service Station
* Car make, model, regno and status
* No of Cars in for Service
* No of cars out after Service

'''( Highlight “status” )'''

'''( Highlight “No of cars out after service” )'''
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| For the Assignment,

This assignment is a continuation of the static variable assignment.

Make sure that you have completed the '''Static variable''' assignment.

We will highlight only the modifications here.

Here we have a variable to represent “'''status”.'''

It is used to indicate whether the car is''' “in”''' for service or''' “out”''' after service

We will also have another variable to represent

'''No of cars out after Service'''

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Slide 13 A'''

* Define a method''' service( Car c)'''

which updates the status to''' ”out”'''

Accordingly it modifies the values for

* '''No of Cars in''' for Service
* '''No of Cars out''' after Service

* Define a method''' show( )''' to print the

car details
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Define a method''' service( Car c) '''which updates the status to''' ”out”'''

Accordingly it modifies the values for

* '''No of Cars in''' for Service
* '''No of Cars out''' after Service

Also define a method''' show( )''' to print all the car details

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Slide 13 B'''

* Identify the''' instance variables''' and

'''static variables'''

* Also Identify the''' instance methods''' and''' static methods'''

* Define a''' constructor''' to initialise the

values for Car''' make, model, regno''' and''' status'''

'''( Highlight “static method” )'''
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| As before,

We need to perform the following as listed

Note that we have to identify and define the '''static method''' as required

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Slide 13 C'''

* Also create a''' Demo''' class containing

the main method

Inside the main method

* Create a few objects of''' CarService'''

* Invoke the''' service( )''' method on some

of them

* Invoke the''' show( )''' method using all the objects and verify the results

| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Also create a''' Demo''' class.

Inside the main method

Create a few objects of''' CarService.'''

Invoke the''' service( )''' method on some of them.

Invoke the''' show( )''' method using all the

objects and verify the results.

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

(retain the slide as in TEX file)
| style="border:1pt solid #000001;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 #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''About Workshops'''

(retain the slide as in TEX file)
| style="border:1pt solid #000001;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 #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''About NMEICT'''

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

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

|-
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| '''Contributor slide'''

(retain the slide as in TEX file)
| style="border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| This script has been contributed by:

'''Dept. of Information'''

'''Technology, Amal Jyothi College of Engineering.'''

This is Priya from IIT Bombay, thanks for joining.

|}

Java/C3/Static-Methods/English - Revision history

Nancyvarkey at 05:50, 3 January 2017

Priyacst at 05:11, 2 January 2017

Priyacst: Created page with "'''Title of script:''' Static Methods '''Author:''' Joms Antony '''Keywords:''' Static methods, Class methods, Instance methods, Static variables {| style="border-spacing:..."