1. Unit-1 Introduction to Java
Variables

2. Variables
A variable is used to store a data that can change as the program executes.
Variables are labels that describe a particular location in memory and associate it with a data type.

3. How to initialize variables

4. constants
A constant is used to store a data that can’t be changed as the program executes, and many of the skills for initializing variables also apply to initializing constants.

5. How to initialize constants
many of the skills for initializing variables also apply to initializing constants.
However, you begin the initialization statement for a constant with the final keyword.
As a result, constants are sometimes called final variables.
In addition, it’s a common coding convention to use all uppercase letters for the name of a constant and to separate the words in a constant name with underscores.

6. Rules For Naming VARIABLES

7. Variable assignment statement

8. Example Of Variable Declaration And Assignment