What are data types in Java?

Data Types in Java

Definition:
Data types means the type of data that can be stored in a variable.

Types of data types:

1. Value-type data types
2. Reference-type data types

Value Type Data Types

Value type data types store the values. 

Example: int, float. char, boolean etc.

int a = 67; // here int variable a is a value type data type which stores the value 67.

Reference Type Data Types

Reference type data types store the reference of the values. 

Example: String, array, interface, all classes and wrapper classes etc.

String a = "67"; // here String variable a is a reference type data type which stores the reference of the value "67".

Default values for some data types:

Data Type	Default Values
byte	0
short	0
int	0
long	0L or 0l
float	0.0f or 0.0F
double	0.0 or 0.0d or 0.0D
char	'\u0000'
String (or any object)	null
boolean	false