Everything You Need To Know About Default Methods

A comprehensive reference on Java 8 default methods covering syntax, method resolution rules (classes win over interfaces, more specific interfaces win over less specific ones, manual disambiguation otherwise), conflict resolution, re-abstracting methods, and modifier restrictions. Also explores the design rationale behind interface evolution, how default methods can replace utility classes, comparisons with abstract classes, mixins, and traits, and a classification of default method types (optional, reasonable defaults, unlikely to be overridden).