What is the default scope of a method in Java?

Anything defined as package private can be accessed by the class itself, other classes within the same package, but not outside of the package, and not by sub-classes.

See this page for a handy table of access level modifiers...

The default scope is package-private. All classes in the same package can access the method/field/class. Package-private is stricter than protected and public scopes, but more permissive than private scope.

More information:
http://docs.oracle.com/javase/tutorial/java/javaOO/accesscontrol.html
http://mindprod.com/jgloss/scope.html

Without an access modifier, a class member is accessible throughout the package in which it's declared. You can learn more from the Java Language Specification, §6.6.

Members of an interface are always publicly accessible, whether explicitly declared or not.