Abstract classes and interfaces are plentiful in Java code, and even in the Java Development Kit (JDK) itself. Each code element serves a fundamental purpose: Many developers believe that ...

Sealed classes work together with records and pattern matching to support a more data-centric form of programming ... (See Effective Java, "Prefer interfaces to abstract classes".) ...

If you want to master functional programming, the best place to start is with the Java Function interface ... as is the case with object models designed with abstract classes and interfaces. Power ...