In this tutorial, I demonstrate how to instantiate and use objects by example. We use a JFrame object to create a window, and add a JLabel object to it.
You should probably add: window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // ensures program ends when we close window)
I also mention that Strings are actually objects (as a convenience, Java allows us to instantiate strings by using a string literal, that is, text in quotes).
You can use objects through what is called their interface, in other words, the methods that they make visible to us as users of the object. You can see all of the methods available via Eclipse's code assist feature by typing the object variable name followed by a "." (you can also bring up code assist by pressing ctrl + space).