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When you're working in the Scala REPL and want to see what methods are available on a class/object, you can create an instance of an object, follow that with the "." character, and then press the [Tab] key. This process, known as "tab completion" in the REPL, gives you a preliminary list of methods that can be called on the object.

Here's what this looks like when we try it on an Int object:

Scala constructors FAQ: How do I create a Scala class with multiple constructors (secondary constructors)?

The Scala approach to defining multiple class constructors is a little different than Java, but somewhat similar. Rather than try to explain this in words, I just created some example source code to demonstrate how this works.

Here's some source code to demonstrate the Scala "multiple constructors" approach:

Java String array FAQ: Can you share some Java array examples, specifically some String array examples, as well as the Java 5 for loop syntax?

Sure. In this tutorial, we'll show how to declare, populate, and iterate through a Java String array, including the Java 5 for loop syntax. Because creating a String array is just like creating and using any other Java object array, these examples can also work as more generic object array examples.

Many times when you're working with Java servlets and JSP's, you'll want to forward some piece of information from your servlet to your JSP without having to put that piece of information into the session. For instance, in many applications you may not have a user session, and in other cases where you do have a session, you may just not want to put a bunch of junk in there.

Question: What UML diagram can I use to show how an object state changes during its lifetime?

A UML state diagram will do the trick. A state diagram is very good for showing how an object state changes over the lifetime of a software application, and the triggers (triggering events) that cause the state to be changed.