Anonymous classes are verbose and obfuscating. Functional implementations can oust them from their last strongholds (mainly abstract classes).

nipafx (Nicolai Parlog)

Anonymous classes in Java are verbose and clunky compared to lambda expressions. While Java 8 lambdas eliminated most anonymous class use cases, they can't be used with abstract classes or multi-method interfaces. The proposed solution is a 'functional implementation' pattern: create a concrete wrapper class that accepts functional interfaces in its constructor and delegates method calls to them. This allows callers to use lambdas and method references even for abstract classes like Swing's AbstractAction or multi-method interfaces like a ValueListener, resulting in much more concise and readable code.

Getting Rid Of Anonymous Classes