java data types

Data Types:-In java data types are divided into two parts.

•  primitive data types
•   secondary data types

Primitive data types:-there are total eight data types into java and there wrapper classes.

          

Data type	Wrapper classes
byte	Byte
short	Short
int	Integer
long	Long
float	Float
double	Double
char	Character
boolean	Boolean

In the real world we have many types of data exist like 10,106,100,500.50, 100.10,”javaindore”,’A’,’5’, true and false.

Here 10,106 and 100=========whole number [byte, short, integer and long].

500.50 And 100.10===========floating number [float and double].

‘A’ and ‘5’              ============character [character].

true and  false     ============boolean [boolean].

Data Type	Keyword	Size
byte	byte	8bit
short	short	16bit
int	int	32bit
long	long	64bit
float	float	32bit
double	double	64bit
char	char	16bit
boolean	boolean	Not define

For data type we have to know only name of java data type only other things we can achieved by program.

Demo program for int data type,if we replace Integer to Byte then that will be demo program for byte data types,…….

class Test

{

public static void main(String[]args)

{

System.out.println(Integer.SIZE);                         //32   bit

System.out.println(Integer.BYTES);                    //4 byte

 System.out.println(Integer.MIN_VALUE);       //   -2,147,483,648

System.out.println(Integer.MAX_VALUE);    //      2,147,483,647

}

}

Above program will not work for Boolean class because of except Boolean class remaining all wrapper classes declared SIZE, BYTES, MIN_VALUE AND MAX_VALUE as a public static and final variable.

Example of Secondary data types are:-class,arrays,string......