Declaring Variables
2 min read ·
What Does Declaring a Variable Mean?
Declaring a variable means:
- Telling Java what type of data you want to store
- Giving that variable a name
When you declare a variable, memory space is reserved, but no value is stored yet.
Basic Syntax
The general syntax for declaring a variable in Java is:
Example:
Here:
int,double,char,String→ Data typesage,salary,grade,name→ Variable names
Important
Declaration only creates the variable. It does not assign any value.
Runnable Example – Declaring Variables
Here is a complete Java program that declares variables correctly:
This code will compile and run without errors.
Declaring Multiple Variables of Same Type
You can declare multiple variables of the same type in one line:
Runnable example:
Common Data Types Used While Declaring
| Data Type | Used For |
|---|---|
| int | Whole numbers |
| double | Decimal numbers |
| char | Single character |
| String | Text |
Example:
Important Rules
- Variable name cannot start with a number.
- Java is case-sensitive (
ageandAgeare different). - Semicolon
;is compulsory. - Variable name should not be a Java keyword.