As a developer, sometimes I come across certain scenarios where I am not sure what Array, String, or Math method to use to solve a particular problem, this App was built to solve that problem. This ...

Behind the scenes, when you write String::toUpperCase, Java binds each element of the stream (String object) to the toUpperCase() method. This means String::toUpperCase is interpreted as s -> s ...

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 ...