Sun Certification Training Guide (310-025, 310-027): Java™ 2 Programmer and Developer Exams

Chapter 6, “Overloading, Overriding, Runtime Type, and Object Orientation”

Because Java classes can only have one parent, Java does not support multiple inheritance.

Classes are declared using the following syntax:

modifiers class ClassName extendsClause implementsClause {
 // Class body
}

A top-level class can be declared as public, final, or abstract.

You are likely to encounter several questions on the certification exam that test your ability to design a class using an English-language specification of the class's characteristics. This description will specify relationships using is a and has a. is a specifies a subclass relationship, and has a identifies a field variable also known as composition.

If a class does not declare a constructor, ...