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Get Started: Java Identifiers

In This Article, You Will Learn about Java Identifiers.

Java Identifiers – Before moving ahead, let’s know a bit about Java Declare Multiple Variables.

Table of Contents

Java Identifiers

Not in Java but in all programming languages, variables are defined with a different name, and these distinct names are called Identifiers

It can be a short name like A, B, or C and a long name like firstName, or secondName. 

Here is a list showing rules to define variable names in Java –

  • Names can contain letters, digits, underscores, and dollar signs
  • Names must begin with a letter
  • Names should start with a lowercase letter and it cannot contain whitespace
  • Names can also begin with $ and _ (underscore)
  • Names are case sensitive (“firstVariable” and “firstvariable” are different variables)
  • Reserved words (like Java keywords, such as int, String, integer, char, and boolean) cannot be used as names

Note: It is said that a long name should be used as a variable name for better clarification of code.

Long Name Variable.

Example: Define a long name variable.

				
					public class Main {
  public static void main(String[] args) {
    // long name
    int marksPerSubject = 80;
    System.out.println(marksPerSubject);
  }
}
				
			

Short Name Variable.

Example: Define a short name variable.

				
					public class Main {
  public static void main(String[] args) {
    // short name, does not fit good always
    int m = 80;
    System.out.println(m);
  }
}
				
			

Both Long & Short Name Variable.

Example:  Define both short and long name variable.

				
					public class Main {
  public static void main(String[] args) {
  
    // long name
    int marksPerSubject = 80;
    // short name, does not fit good always
    int m = 80;
    
    System.out.println(marksPerSubject);
    System.out.println(m);
  }
}
				
			

If you find anything incorrect in the above-discussed topic and have further questions, please comment below.

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