A variable is like a box having a value inside it and a name slip on it

Syntax of a variable

datatype variable_name = value;

Example 1

We can store integers in our variable

int a = 1;
System.out.println(a);

OUTPUT

1

Example 2

We can also store String in our variable

String a = "Hi";
System.out.println(a);

OUTPUT

Hi

Final Variables

Final variables are those which cannot change their value.

Example 1

final int a = 1;
a = 3;   // We'll get an error as we're trying to change the final variable
System.out.println(a);

OUTPUT

ERROR

Example 2

final String a = "Hi";
a = "Bye";   // We'll get an error as we're trying to change the final variabl
System.out.println(a);

OUTPUT

ERROR