A Collection in simple terms means when a group of similar things, often a group created by someone is known as a collection. A collection when collected works like a container – it groups multiple ...

But I don't know how to edit objects of the class based on the input from the user. Or if that is even possible. Yes it's possible. You're already doing it for firstname and lastname. From what you've ...

Java 1.4 introduced the java.lang.StackTraceElement class to describe an element representing a stack frame in a stack trace. This class provides methods that return the fully qualified name of the ...