Different Java Variables and Data Types

Java Variables

Well, today we are going to discuss the different types of Java variables and data types which are useful for all the users who are working on this language. Our expert has already ranked Java as the top five programming language of 2019, so there are plenty of reasons to learn few things regarding this language.

Okay, so in layman’s words, a variable is a location on the memory unit to store the data. To identify the different storage areas, each variable should be given the unique name which is called as Java Identifiers. It is a topic for another day.

Procedure to Declare Java Variables

Let’s take an example to understand the process of declaring a variable in Java.

int speedLimit = 80;

In the example, speedLimit is a variable of int data type and it is given the value 80. It means that speedLimit variable can store the value integrated into it. The value has been assigned to the variable at the time of declaration, but it’s not mandatory. The value can be declared without variables. Value can be later stored as per your wish. Such as;

int speedLimit;
speedLimit = 80;

The value of a variable can be easily changed in this program, that’s why the name ‘variable’ stands out most. For example;

int speedLimit = 80;
… .. …
speedLimit = 90;

Java is a statistic based language which means that all the variables need to be officially declared before using them. Moreover, you can not change the data type of a variable within the scope of Java language. If you are wondering what is Java scope, then don’t lose your focus here and just remember this equation is ethnically wrong;

int speedLimit = 80;
… .. …
float speedLimit;

Rules for Naming Java Variables

Java is well structured and functional programming language with its own set of rules and conventions. Especially, for naming the variables it has some specific rules, such as;

– Variables of Java are case sensitive.
– A variable’s name is a sequence of Unicode letters and digits. It can begin with a letter, $ or _. However, it’s a convention to begin a variable name with a letter. Also, the variable name cannot use whitespace in Java.
– Make sure that when you are creating the name of variables, it should market some sense. For example, marks, score, number, level are few variable names which make some sense whereas a variable name like f, l, d, g, and s doesn’t make any sense.
– If you want a one-word variable name, then make sure to use all the lower case letters. Such as, it is advised to use level, instead of LEVEL or lEVEL or levEL.
– If you want to select the variable name with more than one variable, then you should use all lowercase letters for the first word and capitalize the first letter of each subsequent word. For example, speedLimit is the accurate way to name the variable, but SpeedLimit or Speedlimit are wrong.

Different types of Java Variables

There are mainly four different types of Java Variables are available in this programming language, namely:
• Instance Variables
• Class Variables
• Local Variables
• Parameters

So, people we have to cut short here and to learn about the different types of Java data, you have to wait for our next post keenly. Meanwhile, keep reading and expanding your knowledge bank.

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