Identifier-in-Java .

In this session i have discussed identifier in Java .

Identifier refers the name of variable , function , class etc . It is always user defined .

Rules for Writing Identifier

1-First letter of an identifier must be alphabet (underscore is also allowed)

2-Identifier can only contain letters, digits and underscores

3-White space is not allowed

4-Keywords can not be used as identifier .

5-Upper and lower case both allowed . The identifier written in lowercase differ from upper case .

    int sum

sum is the identifier of integer type .

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