For an excellent introduction to the new features of Java 8, including three chapters on lambda expressions, see the relatively small book, Java SE 8 for the Really Impatient (Cay Horstmann ...

Like C# lambda expressions, Java 8 lambda expressions tie an argument list to a body. For example, (int x) -> x * x specifies an integer parameter that’s named x and returns the value of x squared.

Angelika Langer, Klaus Kreft discuss using Streams in Java 8: what they are, parallel or sequential execution, intermediate and terminal operations, stateless operations, and fluent programming.

When the runtime settings are configured, you can use the AWS Console’s Lambda test tab to invoke the function. Add the text “Hello World” as event data for the function call, and click Test. Java ...

java.util.function.UnaryOperator @FunctionalInterface public interface UnaryOperator<T> extends Function<T,T> T apply(T t) Applies this function to the given argument. Parameter Types: T - the input ...