Java's interface language feature often puzzles newcomers to this language. Jeff eliminates this mystery by presenting the six roles that interfaces play in the Java language.

Proposal for enhancing the Java programming language would define interfaces for sequenced collections, sequenced sets, and sequenced maps.

The functional Predicate interface gets used extensively by the Java 8 Streams API. Any developer who wants to master functional programming in Java will need to be comfortable with the Predicate ...