Data Types in Java

Data Types can be defined as the set of values which can be stored in a variable along with the operations that can be perform defined ed on those values.
Data types are used to identify the type data.

Data Types

Primitive Type	Size	Minimum Value	Maximum Value	Wrapper Type
char	16-bit	Unicode 0	Unicode 216-1	Character
byte	8-bit	-128	+127	Byte
short	16-bit	-215 (-32,768)	+215-1 (32,767)	Short
Int	32-bit	-231 (-2,147,438,648)	+231-1 (2,147,483,647)	Integer
long	64-bit	-263 (-9,223,372,036,775,808)	+263-1 (9,223,372,036,854,775,807)	Long
Float	32-bit	Approx range 1.4e-045 to 3.4e+038		Float
Double	64-bit	Approx range 4.9e-324 to 1.8e+308		Double
boolean	1-bit	true or false		Boolean

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Example program to demonstrate the data types.

Data Types Programs

Integer Types

Byte

It can store Whole Number from -128 to 127.

Example:

byte myNum = 100;
System.out.println(myNum);

Short

It can Store whole number from -32768 to 32767

Example:

short myNum = 5000;
System.out.println(myNum);

Int

It can Store whole number -214748648 to 214783647. In general, and in our tutorial, In Our data type is preferred data type when we creat variable with a numeric Value.

Example:

int myNum = 100000;
System.out.println(myNum);

Long

It can Store whole numbers -922337203685775808 to 9223372036854775807. This is used when int is not large enough to store the value.

Note: That we should end the value with an ‘L’.

Example:

long myNum = 15000000000L;
System.out.println(myNum);

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Floting Point Types

we should use a floating-type whenever we need a number with a decimal, such as 9.99 or 3.14515

Flot

It can store fractional numbers from 3.4e-038 to 3.4e+038.

Note: That we should end the value with an ‘F’

Example:

float myNum = 5.75f;
System.out.println(myNum);

Double

It can store fractional numbers from 1.7e-308to1.7e+038

Note: That we should end the value with a ‘d’:

Example:

double myNum = 19.99d;
System.out.println(myNum);

Scientific Numbers

Floating-Point number can be scientific number with ‘e’ to indicate the power of 10:

Example:

float f1 = 35e3f;
double d1 = 12E4d;
System.out.println(f1);
System.out.println(d1);

Booleans

A boolean data type is declared with the Boolean Keywords and can only allow the values of false:

Example:

boolean isJavaFun = true;
boolean isFishTasty = false;
System.out.println(isJavaFun);     // Outputs true
System.out.println(isFishTasty);   // Outputs false

Boolean Values are mostly used for conditional testing.

Characters

It is used to store a single character. The character must be bounded by single quotes, like ‘A’ or ‘c’:

Example:

char myGrade = 'B';
System.out.println(myGrade);

Alternatively, we can use ASCII value to display certain Characters:

Example:

char a = 15, b = 61 c = 65;
System.out.println(a);
System.out.println(b);
System.out.println(c);

Strings

It is used to store a sequence of characters(text). String values must be surrounded by double quotes:

Example:

String greeting = "Hello Besant Technologies";
System.out.println(greeting);

A string in Java is really a non-premitive data type, because it refer to an object

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General

Data Types in Java