Why does Java's standard class library contain empty interfaces like Cloneable and Serializable? Find out why in this sixth installment in the "Object-oriented language basics" series. You'll also ...

Java's interface language feature often puzzles newcomers to this language. Jeff eliminates this mystery by presenting the six roles that interfaces play in the Java language.

Code that wants to use the interface methods can declare an object of the interface type, get one from somewhere (often people write Factory classes to do this) and call the interface methods ...