The Java Tutorial goes on to list bullets for when an abstract class should be considered and for when an interface should be considered. Unsurprisingly, these are derived from the previously ...

// There are two ways to achieve abstraction in java // Abstract class (0 to 100%) and Interface (100%) // Abstract class needs to be extended and its method implemented.

Most introductory Java texts take an implementation-centric stab at how to use interfaces and abstract classes. However, few provide a clear design distinction for choosing between these two ...