Variable in Java Programming with Example

What is Variable

A variable is like a container that stores information which can be used and manipulated by a program. Variables have names, and these names are used to access the stored data.

Think variable as a box having a name where you can keep a piece of data that you can use later in your program. You can also change the data stored in a variable whenever you want.

Video Explanation

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A variable has three key concept and they are:

• Name: This is the label you give to the variable.
• Value: This is the information you want to store in the variable.
• Data Type: This indicates what kind of data the variable is holding (e.g., a number, text, etc.). We will discuss about it in our next lesson.

Let's see some real-life examples of variables. Image you are organizing a birthday party and need to keep track of various details. So let's see how you can store those details in variables.

Let's take another Example

a = 5
a = 25

In the above example, a is used as a variable name to store the value 5 in it. So we can say that the value of the variable a is 5.

On the second line we have changed the value of the variable a by storing a new value 25 in it. Now the new value of variable a is 25.

So it is clear from the above example that a variable can store only one value at a time if you store any other value in it then the previous value will be erased and the new value will be stored in it.