This project provides the code samples for the CodeFX post about instance identity of lambda evaluations. In particular it demonstrates that the current JRE (or at least Oracle JRE 1.8.0_25-b18 for Win 64) reuses the same instance for repeated evaluations of the same non-capturing lambda expression.

There is not much code. The ImmediateFuture is a functional interface which extends Future and only leaves get() unimplemented. The FutureFactory uses lambda expressions to create instances of this particular Future. Finally CreatingInstances shows that the non-capturing lambda expression used in FutureFactory.createWithDefaultResult() always returns the same instance.

This example uses Future to simulate a somewhat realistic use case and to show that this is by no means limited to "obvious" situations where identity of new functional interfaces like Supplier or Consumer are handled.