• Variables In Java | Java Tutorial

    In Java, variable is a name given to a memory location and this variable is associated with a value.

    int x = 99;

    int – data type
    x – variable
    99 – value

    variable x holds integer values and its current value is 99.

    Let’s see how to declare variables in Java

    Syntax to declare a variable in Java:

    data_type variable = value;

    Example:

    int x = 99;

    Variable Naming Convention in Java:

    Earlier we have learnt that Java is a Case Sensitive Language. Even variables have their own naming convention to follow.

    1. Variable name can starts with special characters such as _ or $

    Example:

    int $myAge;

    2. Variable name should begin with lower case leter

    Example:

    Wrong way: int Age;
    Correct way: int age;

    3. If the variable name consists of more than one word, it’s a best practice to capitalize the first letter of each subsequent word.

    Example:

    Wrong way: int myage;
    Correct way: int myAge;

    4. Variable name should not contain white spaces

    Example:

    Wrong way: int my Age;
    Correct way: int myAge;

    Types of Variables in Java:

    There are three types of variables in Java.

    1. Local variable
    2. Instance variable
    3. Class/Static variable

    Let’s see each variable in detail.

    Local Variable:

    Local variable is a variable which we declare inside a Method. A method will often store its temporary state in local variables.

    Instance Variable (Non-static):

    Instance variable is a variable which is declared inside a Class but outside a Method. We don’t declare this variable as Static because these variables are non-static variables.

    Class Variable (Static):

    Class variable is a variable which is declared as Static. Additionally, the keyword final could be added to include that the value will never change.

    Sample Program 1:

    Sample Program 2:

    Must Read: Java Tutorial

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