what is Java Variable and Data type

Java Variable 

A variable is a named storage location in computer memory that holds a data value, which can be modified during program execution. It serves as a symbolic representation for data, allowing programmers to manipulate and reference values within their code. Variables have a data type, such as integers, floating-point numbers, characters, or custom objects, which defines the type of data they can hold.

Variable Data Types in Java

In Java, data types specify the types of values that can be stored in variables. There are two categories of data types:

1. Primitive Data Types: These are the basic data types built into the Java language. They include:
  - `boolean`: Represents true or false values.
  - `char`: Represents single characters.
  - `byte`, `short`, `int`, `long`: Represents integers of varying sizes.
  - `float`, `double`: Represents floating-point numbers.

2. Reference Data Types: These data types are references to objects in memory. They include:
  - Classes
  - Interfaces
  - Arrays
  
Java also provides the ability to create custom data types through classes and interfaces, which are considered reference data types.