What are Data Type In Java? | Java Programming For Beginners

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There are majorly two types of languages.


First, one is Statically typed language where each variable and expression type is already known at compile time. Once a variable is declared to be of a certain data type, it cannot hold values of other data types.
Example: C, C++, Java.
The other is Dynamically typed languages. These languages can receive different data types over time.
Example: Ruby, Python
Java is statically typed and also a strongly typed language because, in Java, each type of data (such as integer, character, hexadecimal, packed decimal, and so forth) is predefined as part of the programming language and all constants or variables defined for a given program must be described with one of the data types.
Data Types in Java

Java has two categories of data:


Primitive Data Type: such as boolean, char, int, short, byte, long, float, and double
Non-Primitive Data Type or Object Data type: such as String, Array, etc.






Primitive Data Type

Primitive data are only single values and have no special capabilities.




There are 8 primitive data types:


1. boolean: boolean data type represents only one bit of information either true or false, but the size of the boolean data type is virtual machine-dependent. Values of type boolean are not converted implicitly or explicitly (with casts) to any other type. But the programmer can easily write conversion code.


Syntax:

boolean booleanVar;
Size:

virtual machine dependent
Values:

true, false
Default Value:

false



// Java program to demonstrate boolean data type

class GeeksforGeeks {
public static void main(String args[])
{
boolean b = true;
if (b == true)
System.out.println("Hi Geek");
}
}

Output:

Hi Geek




2. byte: The byte data type is an 8-bit signed two’s complement integer. The byte data type is useful for saving memory in large arrays.


Syntax:

byte byteVar;
Size:

1 byte ( 8 bits )
Values:

-128 to 127
Default Value:
0

// Java program to demonstrate byte data type in Java

class GeeksforGeeks {
public static void main(String args[])
{
byte a = 126;

// byte is 8 bit value
System.out.println(a);

a++;
System.out.println(a);

// It overflows here because
// byte can hold values from -128 to 127
a++;
System.out.println(a);

// Looping back within the range
a++;


0
4. int: It is a 32-bit signed two’s complement integer.


Syntax:

int intVar;
Size:

4 byte ( 32 bits )
Values:

-2, 147, 483, 648 to 2, 147, 483, 647 (inclusive)
Default Value:

0
Note: In Java SE 8 and later, we can use the int data type to represent an unsigned 32-bit integer, which has value in the range [0, 232-1]. Use the Integer class to use int data type as an unsigned integer.

5. long: The long data type is a 64-bit two’s complement integer.


Syntax:

long longVar;
Size:

8 byte ( 64 bits )
Values:
-9, 223, 372, 036, 854, 775, 808
to
9, 223, 372, 036, 854, 775, 807
(inclusive)
Default Value:

0
Note: In Java SE 8 and later, you can use the long data type to represent an unsigned 64-bit long, which has a minimum value of 0 and a maximum value of 264-1. The Long class also contains methods like comparing Unsigned, divide Unsigned, etc to support arithmetic operations for unsigned long.

6. float: The float data type is a single-precision 32-bit IEEE 754 floating-point. Use a float (instead of double) if you need to save memory in large arrays of floating-point numbers.


Syntax:

float floatVar;
Size:

4 byte ( 32 bits )
Values:

upto 7 decimal digits
Default Value:

0.0
7. double: The double data type is a double-precision 64-bit IEEE 754 floating-point. For decimal values, this data type is generally the default choice.


Syntax:
double doubleVar;
Size:

8 byte ( 64 bits )
Values:

upto 16 decimal digits
Default Value: