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A Variable Stores Data On The Basis Of Datatypes In Java

By: Infocampus Home | Computers-and-Technology


Introduction :
Datatypes defines the type of data that a variable can store .
Based on the data type of a variable, the operating system allocates memory and decides what can be stored in the reserved memory. Therefore, by assigning different data types to variables, we can store integers, decimals, or characters in these variables.
About Datatypes :
Datatype is a spacial keyword used to allocate sufficient memory space for the data, in other words Data type is used for representing the data in main memory (RAM) of the computer.

There are two types of data types are available in Java '
1)Primitive Data Types
2)Reference/Object Data Types/Non primitive java course in bangalore data types

Primitive Data Types :
Primitive datatypes are the datatypes those are already defined in java.
These are eight in numbers . Primitive datatypes are predefined by the language and named by a keyword.
These are byte , short , int , long , float , double , Character , boolean
byte
-Byte data type is an 8-bit signed two's complement integer
-Minimum value is -128( i.e.- 2^7)
-Maximum value is 127 (i.e. 2^7-1)
-Default value is 0
-It is used to save space in large java/j2ee classes bangalore arrays, mainly in place of integers, since a byte is four times smaller than an integer.
-Example: byte x = 101 , byte y = -54
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 (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 integer
-Default value is 0.
-Example: short x = 10000, short y = -20000
int :
-Int data type is a 32-bit signed two's complement Advanced java training in bangalore integer.
-Minimum value is - 2,147,483,648 (-2^31)
-Maximum value is 2,147,483,647 (2^31 -1)
-Integer 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 x = 100000, int y = -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 (2^63 -1)
-This type is used when a wider range than int is needed
-Default value is 0L
-Example: long x = 100000L, long y= -200000L java/j2ee classes bangalore
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 best core java training in bangalore never be used for precise values such as currency
-Default value is 0.0d
-Example: double x = 121.9
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
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'
Reference Datatypes/Nonprimitive datatype :
These are the data types java course in bangalore which are derived from the existing datatypes
-Reference variables are created using defined constructors of the classes. They are used to access objects. These variables are declared to be of a specific type that cannot be changed. For example, Employee, Student , etc.
-Class objects and various type of array variables come under reference datatype.
-Default value of any reference variable is null.
-A reference variable can be used to refer any object of the declared type or any compatible type.
-Example: Employee emp = new Employee(abc);
Some Important points :
-All numeric data types java training center bangalore are signed(+/-).
-The size of data types remain the same on all platforms (standardized)
-char data type in Java is 2 bytes because it uses UNICODE character set. By virtue of it , Java supports internationalization. UNICODE is a character set which covers all known scripts and language in the world.
This is the short description about the datatypes . To get the more knowledge on Core & Advanced java join Infocampus Software Training Institute .




Article Source: http://www.eArticlesOnline.com

About the Author:
Infocampus is the best institute for the java course in bangalore .It provides java training in less fees with the 100% job support . Learn OOPs concept , packages , inner classes , servlet , struts framework , JDBC connectivity in Core & Advanced java class . Infocampus provides best core java training with the real time project .
For java/j2ee classes hard copy of notes is provided for the preparation of students . Fully practical classes are available for Advanced java training .Every weekend free demo classes are available .
To book the seat for free demo class call at : 9738001024 or to get the more information on java course enquire at : http://www.infocampus.co.in/java-training-bangalore.html

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