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Java : Variable and Datatype

Tutorial by:Arena Buocel      Date: 2016-04-29 22:47:38

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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 Type Default Value Default size
boolean false 1 bit
char '\u0000' 2 byte
byte 0 1 byte
short 0 2 byte
int 0 4 byte
long 0L 8 byte
float 0.0f 4 byte
double 0.0d 8 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.

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