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Wednesday, February 10, 2016

Variable and Datatype in Java

Variable and Datatype in Java

In this page, we will learn about the variable and java data types. Variable is a name of memory location. There are three types of variables: local, instance and static. There are two types of datatypes in java, primitive and non-primitive.

Variable

Variable is name of reserved area allocated in memory.
variable in java
  1. int data=50;//Here data is variable  

Types of Variable

There are three types of variables in java
  • local variable
  • instance variable
  • static variable
types of variable

Local Variable

A variable that is declared inside the method is called local variable.

Instance Variable

A variable that is declared inside the class but outside the method is called instance variable . It is not declared as static.

Static variable

A variable that is declared as static is called static variable. It cannot be local.

We will have detailed learning of these variables in next chapters.

Example to understand the types of variables

  1. class A{  
  2. int data=50;//instance variable  
  3. static int m=100;//static variable  
  4. void method(){  
  5. int n=90;//local variable  
  6. }  
  7. }//end of class  

Data Types in Java

In java, there are two types of data types
  • primitive data types
  • non-primitive data types
datatype in java
Data TypeDefault ValueDefault size
booleanfalse1 bit
char'\u0000'2 byte
byte01 byte
short02 byte
int04 byte
long0L8 byte
float0.0f4 byte
double0.0d8 byte

Why char uses 2 byte in java and what is \u0000 ?

because java uses unicode system rather than ASCII code system. \u0000 is the lowest range of unicode system.To get detail about Unicode see below.a
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