Can have instance mutable fields, parameters, or local variables. Only functional interfaces can use the lambda feature in Java. Abstract classes with only one abstract method cannot use lambdas.

The Java Iterator is an all-purpose interface that simplifies looping through a collection of objects. Java's ListIterator provides all the functionality of the Iterator interface, with four ...

Reflection was essential to the advanced Java toolkit ... but in a cleaner API. As the names imply, both MethodHandle and VarHandle give you “handles,” which are variables to reference the ...