VARIABLES

There are two stages in a Variable.

1.       Declaring the variable.

2.       Initializing the variable.

Declaring the variable.

·         Introduce compiler about the variable type.

Initializing the variable.

·         Give a value to variable.

class Test{           public static void main (String args []){ int x;                // Declaring the variable. x=10;               // Initializing the variable. System.out.println(x); } }

Ex 1:

java programme to print the value of x and y.

class Test{             public static void main (String args []){ int x; x=10; int y =3; System.out.println(“x = ”+ x+“, y = ”+y); } }

Ex 1:

java programme to print the sum of x and y.`

class Test{             public static void main (String args []){ int x; x=10; int y =3; System.out.println(“x = ”+ x+“, y = ”+y); System.out.println(“Total = ”+ (x+y) ); } }

Data types.

       

    

Primitive Data types.

byte	8 bits	Default data type for whole numbers.
short	16 bits
int	32 bits
long	64 bits
float	32 bits	Default data type for decimals.
double	64 bits
char	16 bits
boolean	1 bits