In fact, the need to use multiple inheritance could be a sign of a bad design. There are times, however, when developers wish they could extend more than one class. Although Java prevents a ...

A class can implement multiple interfaces ... Only functional interfaces can use the lambda feature in Java. Abstract classes with only one abstract method cannot use lambdas.

sealed classes can improve effectiveness and clarify the intended usage patterns for developers using the code. Sealed classes in Java represent a significant step forward in the language's ongoing ...