Java - A description of its Variables

Here you can find information about Java's use of Variables and a examples of how they are used

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Character Data Type

char variablename = value;

example:

char A_A = 'A'; char A_b = 'b';

 

Numeric Data Types

Type	Range	Size
byte	-128 to 127	8-bit signed
short	-32768 to 32767	16-bit signed
int	-2147483648 to 2147483647	32-bit signed
long	-9223372036854775808 to 9223372036854775807	64-bit signed
float	-3.4E38 to 3.4E38 (6 to 7 digits accuracy)	32-bit IEEE 754
double	-1.7e308 to 1.7e308 (14 to 15 significant digits accuracy)	64-bit IEEE 754

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Constants

final datatype CONSTANTNAME = value;

where:

final : final is a Java keyword that means the constant cannot be changed.

datatype : datatype may be one of byte, short, int, long, float, double, char, boolean

CONSTANTNAME : the constant name is a valid Java Variable name, preferable in all uppercase letters.

value : value is any value appropriate for the datatype

examples:

final double PI = 3.14159; final int Monday = 1; final int Tuesday = 2; final String HELLOWORLD = "Howdy to Earth ";

Boolean Data Type

examples:

boolean isChecked = true; boolean wasConfirmed = false;

String Data Type

examples:

String AuthorName = "John H Doe"; String PleaseCompleteMessage = "Please Complete All Fields";