Tags: static void mainstring void mainstring args public static void mytest public static signed integer bit public static mytest public static void void mainstring mainstring args

October 18th 2011

Hi all,
In this post I am going to share my knowledge in java variables. According to my previous post, I mentioned that a java class is same as a factory. In a factory there should be raw materials to produce something. In a java class, variables do the job of raw materials.

In java we have several kinds of variable types.

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eg: Integer
Double
Char
Float
Long
Byte
Short
Boolean

Integer
Integers are whole numbers, for example, -35, 0, 2048, ....

this is the way of using integers.

class MyTest{
public static void main(String args[]){

int x = 10;
int y = 20;
int z = x + y;

System.out.println(z);
}
}

copy this code and paste to a notepad. Then compile and run to see the output. You can see the output as 30

In this code int x = 10; means,
x is an integer type of variable. Value of x is equal to 10.

Minimum value of an integer is -2,147,483,648 and maximum value of an integer is +2,147,483,647

byte
class MyTest{
public static void main(String args[]){

byte x = 10;
byte y = 20;
int z = x + y;

System.out.println(z);
}
}

Minimum value of a byte variable is -128 and maximum value of a byte variable is +127

short

class MyTest{
public static void main(String args[]){

short x = 10;
short y = 20;
int z = x + y;

System.out.println(z);
}
}

Minimum value of a short variable is -32,768 and maximum value of a short variable is +32,767

long

class MyTest{
public static void main(String args[]){

long x = 10;
long y = 20;
long z = x + y;

System.out.println(z);
}
}

Minimum value of a long variable is -9,223,372,036,854,775,808

and maximum value of long variable is +9,223,372,036,854,775,807

Double
double and float variables are used to represent decimal values

class MyTest{
public static void main(String args[]){

double x = 10.1d;
double y = 20.3d;
double z = x + y;

System.out.println(z);
}
}

float

class MyTest{
public static void main(String args[]){

float x = 10.1f;
float y = 20.3f;
float z = x + y;

System.out.println(z);
}
}

Boolean
A Boolean variable has two values(true or false).

This is the way of assigning a value to a boolean variable

boolean b = false;

String

class MyTest{
public static void main(String args[]){

String name = "mahesh";
System.out.println(name);
}
}

Data Type	Description	Size	Default Value
boolean	true or false	1-bit	false
char	Unicode Character	16-bit	\u0000
byte	Signed Integer	8-bit	(byte) 0
short	Signed Integer	16-bit	(short) 0
int	Signed Integer	32-bit	0
long	Signed Integer	64-bit	0L
float	Real number	32-bit	0.0f
double	Real number	64-bit	0.0d