Initialization, declaration and assignment terms in Java

A variable provides us with named storage that our programs can manipulate. Each variable in Java has a specific type, which determines the size and layout of the variable's memory; the range of values that can be stored within that memory; and the set of operations that can be applied to the variable.

You must declare all variables before they can be used. Following is the basic form of a variable declaration − data type variable [ = value][, variable [ = value] ...] ;

Here data type is one of Java's datatypes and variable is the name of the variable. To declare more than one variable of the specified type, you can use a comma-separated list.

Following are valid examples of variable declaration and initialization in Java −

Example

int a, b, c;            // Declares three ints, a, b, and c.
int a = 10, b = 10;     // Example of initialization
byte B = 22;            // initializes a byte type variable B.
double pi = 3.14159;    // declares and assigns a value of PI.
char a = 'a';           // the char variable a is initialized with value a