<dependency> <groupId>org.functionaljava</groupId> <artifactId>functionaljava</artifactId> <version>4.8</version> </dependency> Function<Integer, Integer> addOne = x -> x + 1; Function<Integer, Integer> multiplyByTwo = x -> x * 2; Function<Integer, Integer> combinedFunction = addOne.andThen(multiplyByTwo); Function<Integer, Integer> addOne = x -> x + 1; Function<Integer, Function<Integer, Integer>> add = x -> y -> x + y; Lazy<Integer> lazyValue = Lazy.lazy(() -> expensiveComputation()); int result = lazyValue.get();