Method References

Four types: Class::static, object::instance, Class::instance (stream element is receiver), and Class::new, all replacing lambdas that call one existing method.

(a, b) -> a.compareTo(b) equals String::compareTo: the first argument is the receiver, the second is the method's argument.

e -> e.getName() is exactly Employee::getName: the lambda parameter becomes the method receiver.

Employee::new is a factory reference: feed it data and it calls the matching constructor to build objects.

System.out::println is a bound reference: the receiver is the specific System.out object, so forEach prints each element.