Integer Data Types In Java

Datatypes > Primtive Dataypes >
Siva Nookala - 16 Feb 2019

The integer data types are used to store whole numbers like 2, 3, 267, -1245, 0, 8382923 etc. Integers do not contain decimal points, so 3.14 and 4221.76 are not valid integers. Java supports four integer types depending upon the sizes - byte, short, int and long

The four integer types in the order of size are:

Type	Size	Range Inclusive	Samples
`byte`	8-bits or 1 byte	-128 to +127, including zero	no. of legs, no. of wickets in match, no. of children, no. of sisters
`short`	16-bits or 2 bytes	-32,768 to +32,767	face book friends, height in centimeters, number of runs in a match, total runs of a cricketer
`int`	32-bits or 4 bytes	-2,147,483,648 to +2,147,483,647	roads length in kms, population of a state, number of engineering students in a year
`long`	64-bits or 8 bytes	-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807	population of the world, distance to sun in kilo meters, hair count, mobile number

Depending upon the requirement we should choose the appropriate data type

The size allowed is calculated using the number of bytes. For eg for byte the size is 8-bits, so the range allowed is 2 power 8 which is 256. This 256 is split into half to support both negative and positive numbers. That is reason the size is -128 to +127. The positive side is +127 instead of +128, because zero is also included in the range.

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