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Describe the rules governing identifiers. Can identifiers be re-used in the same Java class file? Provide...

Describe the rules governing identifiers. Can identifiers be re-used in the same Java class file? Provide three examples of different kinds of invalid identifiers.
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Answer #1

Identifiers are names of methods, classes, variables, interfaces and packages in java.

1. Rules governing identifiers are

a. An identifier must be composed of letters, numbers and underscore and dollar sign. It must contain atleast a single character
b. Identifier must begin with letter, underscore or dollar.
c. Identifier should not begin with a number


2. Yes, identifiers can be re-used in the same java file multiple times

3.

a. My Var //Can not contain space
b. __$ //Must contain atleast a single letter
c. var- // - is not a valid alphanumeric character
d. 4z //can not start with number

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