Introduction to Variables in Java:
Variables in Java are containers for storing data values. They have a type that defines what kind of data they can hold and a name that identifies them within a program. Java is a statically typed language, meaning that you must declare the data type of each variable before you can use it.
1. Declaring Variables:
Variables in Java are declared using the following syntax:
int age ;
Here, type is the data type (int) of the variable, and name (age)is the identifier for the variable.
2. Declare Variable and Initialization Value:
Variables can also be declared and initialized in a single step:
Example:
Scenario of Integer Variable:
1.In the First step Declare an integer variable named age then initialize the value in the second step.
// Declare an integer variable named ‘age’. It is currently uninitialized.
int age;
// Assign the value 25 to the variable ‘age’.
age = 25;
2. Declare and initialize an integer variable named age with the value 20 in a single step.
// Declare an integer variable named ‘age ’ and initialize it with the value 20.
int age = 20;
Course Video
YouTube Reference :
Variables store data values like numbers or text, defined by a data type (e.g., int
, String
).
Use the format dataType variableName;
(e.g., int age;
).
Scope determines where a variable can be accessed, such as local (method) or global (class).
Class-level variables are accessible throughout the class, while method-level variables are limited to the method.
Use meaningful names, camelCase, and avoid single characters except in loops.
Variables can be initialized during declaration (int num = 10;
) or later in the code.
Primitive variables store basic data types; reference variables store object addresses.
Yes, Iqra Technology offers free beginner-friendly courses on Java variables and scope.
It ensures proper access and prevents unintended behavior in your program.
Visit Iqra Technology’s Java Variables page for detailed tutorials and examples.