JAVA

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JAVA Theory

Variables

A variable is a name which is associated with a value that can be changed. It is a name of memory location.

Declare a variable in java:

Syntax
data_type variable_name = value ;
Ex: int a =10;

Types of variables:

Local variables:

A variable that is declared within a method, constructor or block is called local variable.

Instance variables:

A variable proclaimed inside the class outside any block, constructor or method is called instance variable.

Static/Class variables:

Static variables also known as Class variables are declared with the static keyword in a class.

Syntax
class skill
{ int a = 10;// instance variable
static int m = 50;//static variable
void method()
{ int c = 20;// local variable
} }

Data Types in java

Data types specifies the type of values that can be stored in the variable. There are two types of data types in java.

  1. Primitive Data type - which includes integer, floating, Boolean, character.
  2. Non-primitive Data type - which includes strings, classes, arrays.

Primitive data types

There are 8 primitive data type:

interger types:

* byte
* short
* int
* long

floating-point types:

*float
*double

boolean data type whose values are either true or false.

char data type values are 16-bit Unicode character.

[boolean --- size(1 bit) ]