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Java Tutorial Part 5

Keywords

 Keywords are the predefined words in a program,we can't alter the meaning of keywords.
Ex:- for,do,if,class,public.

 There are almost 62 keywords are in java

 Identifiers

 Which is used to give name for a variable or class or methods.
Rules for a valid identifier are,

 *identifiers name must need to begin with an alphabet not by a number.(i.e. 1name is invalid name1 is valid)

 *Keywords will not be an identifier

 *Case sensitive, upper case and lower case are treated differently
(if you have a variable HELLO and hello, system will treat both in differently)

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