Abstract Method In Java?

Abstract:   

An abstract is a return Type.It must be a extended or sub class.a abstract class contain static data.Any class with an abstract method is automatically abstract itself .

Syntax : abstract class class_Name

               {

                     // Body

               }

Rules :

• Abstract classes are not Interface.

• An abstract class must have an abstarct method.

• Abstract classes can have constructors,member variables and normal methods.

• Abstract class Never instatiated.

• When you extend abstarct class with abstarct method,you must define the abstract method in the child class.

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Features of Android

Because Android is open source and freely available to manufacturers for customization, there are no fixed hardware or software configurations.

• Storage — Uses SQLite, a lightweight relational database, for data storage.

• Messaging — Supports both SMS and MMS. Chapter 8 discusses messaging in more detail

• Media support — Includes support for the following media: H.263, H.264 (in 3GP or MP4container), MPEG-4 SP, AMR, AMR-WB (in 3GP container), AAC, HE-AAC (in MP4 or3GP container), MP3, MIDI, Ogg Vorbis, WAV, JPEG, PNG, GIF, and BMP

• Hardware support — Accelerometer Sensor, Camera, Digital Compass, Proximity Sensor,and GPS.

• Multi-touch — Supports multi-touch screens.

• Multi-tasking — Supports multi-tasking applications.

• Flash support — Android 2.3 supports Flash 10.1.

• Tethering — Supports sharing of Internet connections as a wired/wireless hotspot.

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Version Of Android Os With Release Date?

ANDROID VERSION RELEASE DATE CODENAME

• 1.1                 9 February 2009

• 1.5                 30 April 2009 Cupcake

• 1.6                 15 September 2009 Donut

• 2.0/2.1            26 October 2009 Eclair

• 2.2                  20 May 2010 Froyo

• 2.3                  6 December 2010 Gingerbread

• 3.0/3.1/3.2      22 February 2011 Honeycomb

• 4.0                  19 October 2011 Ice Cream Sandwich

• 4.1.x               9 July 2012,Jelly Bean 

• 4.2.x              13  November  2012 Jelly Bean

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What Is Disructor?

Destructor  : Desructor is member function which is destroy automatically when object is created.

Destructor always must start with  ~ Key Sign.

Syntax:  

              class class_ Name       

              {        

                    ~  constructor Name ( )  // Destructor    

                };

        Example:

                           class A

                          {

                                int i;

                                 public();

                                   ~  A();

                           }

                                     A : A();

                          {

                                   i=1;

                           }

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What is Constructor?

Constructor :  A constructor is a member function which is call automatically When Object is created.

There Are Many Types Of constructor?

• copy

• Default 

• Parameterized

Syntax :  class class_name

               {

                    constructor ( );     // Define constructor

                };

Example:

                           class A

                          {

                                int i;

                                 public();

                                  A();

                           }

                               A : A();

                          {

                                   i=1;

                           }

Example of  Default Constructor :

2) Second Example Of Constructor

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What Is Data Types In Programing Langauge?

Data Type: A Data Types Is Nothing But one Type of store location or Space in Memory  To lacate the variable in there Space.

There Are Two Diffrent Types Of Data Types.

byte:

• Byte data type is an 8-bit signed two's complement integer.
• Minimum value is -128 (-2^7)
• Maximum value is 127 (inclusive)(2^7 -1)
• Default value is 0
• Byte data type is used to save space in large arrays, mainly in place of integers, since a byte is four times smaller than an int.
• Example: byte a = 100 , byte b = -50

char:

• char data type is a single 16-bit Unicode character.
• Minimum value is '\u0000' (or 0).
• Maximum value is '\uffff' (or 65,535 inclusive).
• Char data type is used to store any character.
• Example: char letterA ='A'

short:

• Short data type is a 16-bit signed two's complement integer.
• Minimum value is -32,768 (-2^15)
• Maximum value is 32,767 (inclusive) (2^15 -1)
• Short data type can also be used to save memory as byte data type. A short is 2 times smaller than an int
• Default value is 0.
• Example: short s = 10000, short r = -20000

int:

• Int data type is a 32-bit signed two's complement integer.
• Minimum value is - 2,147,483,648.(-2^31)
• Maximum value is 2,147,483,647(inclusive).(2^31 -1)
• Int is generally used as the default data type for integral values unless there is a concern about memory.
• The default value is 0.
• Example: int a = 100000, int b = -200000

long:

• Long data type is a 64-bit signed two's complement integer.
• Minimum value is -9,223,372,036,854,775,808.(-2^63)
• Maximum value is 9,223,372,036,854,775,807 (inclusive). (2^63 -1)
• This type is used when a wider range than int is needed.
• Default value is 0L.
• Example: long a = 100000L, int b = -200000L

float:

• Float data type is a single-precision 32-bit IEEE 754 floating point.
• Float is mainly used to save memory in large arrays of floating point numbers.
• Default value is 0.0f.
• Float data type is never used for precise values such as currency.
• Example: float f1 = 234.5f

double:

• double data type is a double-precision 64-bit IEEE 754 floating point.
• This data type is generally used as the default data type for decimal values, generally the default choice.
• Double data type should never be used for precise values such as currency.
• Default value is 0.0d.
• Example: double d1 = 123.4

boolean:

• boolean data type represents one bit of information.
• There are only two possible values: true and false.
• This data type is used for simple flags that track true/false conditions.
• Default value is false.
• Example: boolean one = true

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