Datatype in java

Datatype in java

Explaination : Data types in any of the language means that what are the various type of data the variables can have in that particular... August 09, 2017

Explaination :

• Data types in any of the language means that what are the various type of data the variables can have in that particular language. 
• Information is stored in a computer memory with different data types. 
• Whenever a variable is declared it becomes necessary to define data type that what will be the type of data that variable can hold.
• The term data type refers to the type of data that can be stored in a variable. 
• Sometimes, Java is called a “strongly typed language” because when you declare a variable, you must specify the variable’s type. 
• Then the compiler ensures that you don’t try to assign data of the wrong type to the variable.

Data Types available in java are:

1. Primary Data Type (Java supports 8 primitive data types): byte, short, int, long, float, double, char and boolean.
2. Non-Primitive Data Types: string, array etc.

Integer Types

Type	Contains	Default	Size	Range
byte	Signed integer	0	8 bit or 1 byte	-27 to 27-1 or -128 to 127
short	Signed integer	0	16 bit or 2 bytes	-215 to 215-1 or -32768 to 32767
int	Signed integer	0	32 bit or 4 bytes	-231 to 231-1 or -2147483648 to 2147483647
long	Signed integer	0	64 bit or 8 bytes	-263 to 263-1 or -9223372036854775808 to 9223372036854775807

Rational Numbers

Type	Contains	Default	Size	Range
float	IEEE 754 floating point single-precision	0.0f	32 bit or 4 bytes	±1.4E-45 to ±3.40282347E+38F
double	IEEE 754 floating point double-precision	0.0	64 bit or 8 bytes	±439E-324 to ±1.7976931348623157E+308

Characters

Type	Contains	Default	Size	Range
char	Unicode character unsigned	\u0000	16 bits or 2 bytes	0 to 216-1 or \u0000 to \uFFFF

Conditional

Type	Contains	Default	Size	Range
boolean	true or false	false	1 bit	true or false