What are the Primitive DataTypes in java ?

There are eight primitive data types supported by Java. Primitive data types are predefined by the language and named by a keyword.
Let us now look into detail about the eight primitive data types.

byte:

• Byte data type is an 8-bit signed two's complement integer. Minimum value is -128 (-2^7)

• Maximum value is 127 (inclusive)(2^7 -1).

• Default value is 0.

• Byte data type is used to save space in large arrays, mainly in place of integers, since a byte is four times smaller than an int.

Example : byte a = 100 , byte b = -50

short:

• Short data type is a 16-bit signed two's complement integer. Minimum value is -32,768 (-2^15)

• Maximum value is 32,767(inclusive) (2^15 -1).

• Short data type can also be used to save memory as byte data type.

• A short is 2 times smaller than an int.

• The default value is 0.

Example : short s= 10000 , short r = -20000

int:

• Int data type is a 32-bit signed two's complement integer.

• Minimum value is - 2,147,483,648.(-2^31).

• Maximum value is 2,147,483,647(inclusive).(2^31 -1).

• Int is generally used as the default data type for integral values unless there is a concern about memory.

• The default value is 0.

Example : int a = 100000, int b = -200000

long:

• Long data type is a 64-bit signed two's complement integer. 

• Minimum value is -9,223,372,036,854,775,808.(-2^63).

• Maximum value is 9,223,372,036,854,775,807 (inclusive). (2^63 -1) .

• This type is used when a wider range than int is needed.

• The default value is 0L.

Example : long a = 100000L, int b = -200000L

float:

• Float data type is a single-precision 32-bit IEEE 754 floating point.

• Float is mainly used to save memory in large arrays of floating point numbers. 

• Default value is 0.0f.

• Float data type is never used for precise values such as currency.

Example : float f1 = 234.5f

double:

• double data type is a double-precision 64-bit IEEE 754 floating point.

• This data type is generally used as the default data type for decimal values. 

• generally the default choice. 

• Double data type should never be used for precise values such as currency.

• Default value is 0.0d.

Example : double d1 = 123.4

boolean:

• boolean data type represents one bit of information. 

• There are only two possible values : true and false.

• This data type is used for simple flags that track true/false conditions.

• Default value is false. 

Example : boolean one = true

char:

• char data type is a single 16-bit Unicode character. 

• Minimum value is '\u0000' (or 0). 

• Maximum value is '\uffff' (or 65,535 inclusive). 

• Char data type is used to store any character. 

Example . char letterA ='A'