Data Type

Data Types

Primitive

Data type which directly contains value: byte, short, int, long, float, double, char, boolean

Data types	Description	Examples of Literals	Size in Byte	Range Minimum	Range Maximum
byte	8 bit signed integer	64, 0, -1, 60634	1	-128	+127
short	Represents a 16-bit signed integer	23, 32727	2	-32,768	+32,767
int	Represents a 32-bit signed integer	42, -8, 0	4	-2,147,483,648	+2,147,483,647
long	Represents a 64-bit signed integer	42, -8, 0	8	-9x10^18	9x10^18
float	Represents a single-precision 32-bit	2.1f, -8f, 0f	4	+- 10^-45, 7	+- 10^38
double	Represents a double-precision 64-bit floating point number	2.1f, -8f, 0f	8	+- 10^-324	+- 10^308

Non-Primitive Data Type

Data type which holds the reference of the object which was located on the heap. It doesn't hold directly the value rather addresses of the value located in heap. Not-Primitive Data type is classes: Integer, String, Double, etc.

Memory Allocation of Primitive and Non-primitive Data Type

https://www.scientecheasy.com/2018/06/memory-allocation-primitive-nonprimitive.html

Wrapper classes

Data Type	Wrapper Class
int	Integer
long	Long
byte	Byte
double	Double
float	Float
short	Short

Widening and Narrowing

Widening

Small primitive data type value is automatically transformed in wider primitive data type. int -> long, short -> int etc.

     var b: Short = 32323
     var c: Int = 234324234
     c = b.toInt()

Narrowing

casting wider primitive type value to a smaller primitive type value.

    var a: Byte = 127
    var b: Short = 32323
    a = b.toByte()