This ability to implicitly treat instance methods as functions accepting their instance as a parameter is a powerful feature of Java’s lambda expressions and method references. It allows you to ...

I have blogged on this approach previously in posts Too Many Parameters in Java Methods, Part 3: Builder Pattern and NetBeans 7.2: Refactoring Parameterized Constructor As Builder.

At this point, the Scanner still returns a String, although the String contains only one character. To complete the use case, you must convert this one-character String into a single Java char with ...