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Java Variables

Variables are containers for storing data values. It saves the data values during Java program execution. It is the basic unit of storage in a program.

Every variable is assigned a data type that designates the type and quantity of value it can hold.

Variable is a memory location name of the data.

A variable is assigned with a data type.

A variable is a name given to a memory location.

The value stored in a variable can be changed during program execution. It is a combination of “vary + able” which means its value can be changed.

In Java, all the variables must be declared before use.

A variable is the name of a reserved area allocated in memory.

Java Variables

How to declare variables?

Variable declaration in Java

Datatype: Type of data that can be stored in this variable. 

DataName: Name given to the variable. 

How to initialize variables?

Variable initialization in Java

Examples

float simpleInterest; 
// Declaring float variable
int time = 10, speed = 20; 
// Declaring and Initializing integer variable
char var = 'h'; 
// Declaring and Initializing character variable