Java Variables
Java variables
are used to store the data values in the memory location. Each
variables
should be having a unique name.
Create a Variable
You can create a variable using the following syntax,
type variableName = value;
Here, type
represents the type of the variable, variableName
represents the unique name for the variable and value
is the value assigned to the variable. The value
should match the type
of the variable.
Example
string name = "Andrew";
System.out.println(name); // Andrew
Here, string
is the datatype(type) of the variable.
We have declared a variable name
and assigned Andrew
as its value.
Finally, we print the value in the variable name
.
Types of Variable
There are different types of variables available in java. They are,
String
char
int
float
boolean
String Datatype
A series of characters contained in double quotations is referred to as a string. To create a variable of type string we use the keyword String
.
Example
String name = "Readersbuddy";
Character Datatype
Anything that is enclosed within single quotes(''
) is referred to as character. We use the keyword char
to create a variable of type character.
Example
char option = 'a';
Integer Datatype
A number with no fractional or exponential parts is referred to as an integer.
Example
int decNumber = 34;
Float Datatype
A float datatype is a numeric literal that can take either an exponential or a fractional form.
Example
double pi= 3.14;
Boolean Datatype
A boolean datatype, is used to hold a value that can be either true
or false
.
Example
boolean flag = true;