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            A nested class is any class whose declaration occurs within the body of another class or interface \[[JLS 2005|AA. Bibliography#JLS 05]\]. The use of a nested class is error-prone unless the semantics are well understood. A common notion is that only the outer class can access the contents of the nested class. Not only does the nested class have access to the private fields of the outer class, the same fields can be accessed by another class within the package depending on whether the nested class is declared public or if it contains public methods or constructors. By default, the {{javac}} compiler converts the accessibility of private methods of a nested class to package-private.

Also, according to the _Java Language Specification_ \[[JLS 2005|AA. Bibliography#JLS 05]\], [§8§8.3|http://java.sun.com/docs/books/jls/third_edition/html/classes.html#8.3] "Field Declarations,"

\[[JLS 2005|AA. Bibliography#JLS 05]\] [§8§8.1.3, Inner Classes and Enclosing Instances|http://java.sun.com/docs/books/jls/third_edition/html/classes.html#8.1.3] and [§8§8.3|http://java.sun.com/docs/books/jls/third_edition/html/classes.html#8.3] "Field Declarations"
\[[Long 2005|AA. Bibliography#Long 05]\] §2§2.3, Inner Classes
\[[McGraw 1999|AA. Bibliography#McGraw 99]\] Securing Java, Getting Down to Business with Mobile Code