what is identifier in java code example

Example 1: identifiers in java

Identifiers are names in java program. Identifiers can be class name, 
method name or variable name.

  Rules for defining identifiers in java:
1) Identifiers must start with letter, Underscore or dollar($) sign.
2) Identifiers can’t start with numbers .
3) There is no limit on number of characters in identifier but not 
recommended to have more than 15
characters
4) Java identifiers are case sensitive.
5) First letter can be alphabet ,or underscore and dollar sign. 
From second letter we can have numbers
6) We should’nt use reserve words for identifiers in java.

Example 2: identifier in java

Identifiers in Java are symbolic names used for identification. They can be a class name, variable name, method name, package name, constant name, and more. However, In Java, There are some reserved words that can not be used as an identifier