In 1995 Java was developed by James Gosling,Patrick Naughton, Ed Frank, Chris Warth and Mike Sheridan as Sun Microsystems (Owned By ORacle Corp).
Core Java is a prt of Java SE.
Advanced Java is a part of Java SE and Java EE.
Identifiers is a word and it can be used to identify class,interdace,package,variable,method etc.
It can be formed by using alphabets,digits, underscore(_) and dollar sign ($)
Rules To Declare an Identifier:-
- It must begin with alphabet, underscore or dollar sign ($)
- Length of the identifier is not limited.
- It should not contain special symbols other than(_) and ($)
- It should not contain white space characters (tab,space or enter)