Java_Basic Datatypes

Two data types in JAVA

Primitive Data Types and Reference/ Object Data Types.

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'

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

Variables

Based on the data type of a variable, the operating system allocates memory and decides what can be stored in the reserved memory. Therefore, by assigning different data types to variables, you can store integers, decimals, or characters.

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 4 times smaller than an int. Example: byte a = 100 , byte b = -50

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

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. Default value is 0L. Example: long a = 100000L, long b = -200000L

Reference Data Types

Reference variables are created using defined constructors of the classes. They are used to access objects. These variables are declared to be of a specific type that cannot be changed. For example, Employee, Puppy etc. Class objects, and various type of array variables come under reference data type. Default value of any reference variable is null. A reference variable can be used to refer to any object of the declared type or any compatible type. Example: Animal animal = new Animal("giraffe");

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 Default value is 0. Example: short s = 10000, short r = -20000

Primitive data types

There are 8 primitive data types. They are predefined by the language and named by a keyword. 8 primitive data types: byte, short, int, long, float, double, boolean, char

Variables

They are nothing but reserved memory locations to store values. This means that when you create a variable you reserve some space in memory.