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General

Data types in java

Data Types in Java

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

Example program to demonstrate the datatypes.

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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