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Where does it say that? It's not what is in post#1

A variable can only be defined once. Remove or rename the second definition.



There is no add() method in the ArrayList class that takes an int for its arg. The arg should be an object of the...

Did you solve the problem? I don't see any questions or error messages in the last post.

The syntax for the method definition is wrong.
See the tutorial: Defining Methods (The Java™ Tutorials > Learning the Java Language > Classes and Objects)

See the tutorial: Defining Methods (The Java™ Tutorials > Learning the Java Language > Classes and Objects)

Copy the full text of all error messages and paste it here.

Look at the formatting of...

Give it a try.

See the tutorial: Defining Methods (The Java™ Tutorials > Learning the Java Language > Classes and Objects)
Passing Information to a Method or a Constructor (The Java™ Tutorials > Learning the Java...

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Please post your code and any questions about problems you are having.