Netbeans told that "declared variable" is a package that does not exist

Question

It happened when I tried to use a ListSelectionModel.

Did I made some mistake?

Answer 1

You typed the statement at the wrong spot:

class X {

    HERE - WHERE THE FIELD DECLARATIONS GO

    X() {
        STATEMENT SHOULD GO HERE
    }

The compiler thinks to deal with a declaration, starting with a class, which may be x.y.z.C.