Types of variables in Java

February 18, 2022

Tags: Technologies


Java is one of the most widely used programming languages ​​for creating web pages and mobile applications. According to its official website, "Java is a programming language and computing platform first released by Sun Microsystems in 1995. It has evolved from humble beginnings to power much of today's digital world, providing the trusted platform on which to build many services and applications".


Simply put, Java is a cross-platform, object-oriented, web-centric language. It is very popular among software engineers and is also widely used as a computing platform.


In this article, we will talk about Java variables and what is the use that can be given to each of them.


What is a variable in Java?


When we talk about Variables in Java, we refer to a data container that stores the values ​​during the execution of the Java program. Inside this container, each variable is assigned a data type that works to designate the type and amount of value that each variable can contain.


There are three types of variables in Java: Local, Instance, and Static.


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What does each Java variable consist of?


Local variable: This is a variable that is declared inside the body of a method.


Instance variable: This Java variable is defined without the STATIC keyword, but as outside of a method declaration. They are object-specific variables, which is why they are known by this name.


Static variable: This variable is initialized only once, just when the program execution starts. It is the variable that should be initialized first, especially before an instance variable is initialized.




Java variables example


public class A
    static int m=100;//static variable
    void method()
        int n=90;//local variable
    public static void main(String args[])
        int data=50;//instance variable
}//end of class


What is Java used for?

Being a multiplatform programming language, Java has been given several uses, among these the following stand out:


  • It is used to develop Android applications.
  • It is one of the most popular for creating business software.
  • There is a wide range of mobile Java applications on the market
  • Scientific computing applications
  • Use for Big Data analysis
  • Java programming of hardware devices
  • It is used for server-side technologies like Apache, JBoss, GlassFish, etc.


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