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In the first post of this Simple Calculator App series, we took some baby steps toward creating a simple calculator. We're using the comp, shown below, that graphics designer Mark Dingman of Malden Labs supplied. For teaching purposes, I'm taking a very incremental and sometimes indirect approach to building this. For example, in the first post I used the SwingButton class for the calculator keys. In this post, we'll use a Group that consists of a Rectangle and Text object to create each key. Also, we'll use a for expression to succinctly create the keys -- a technique that has another benefit related to event handling that you'll see in a moment.