[JAVA][Beginning Java 8 Games Development]

Chapter 9 ■ Controlling Your Action Figure: Implementing Java Event Handlers and Using Lambda Expressions
Also, notice that the code-collapsing plus and minus icons in the left margin of NetBeans are also gone! This is
because a lambda expression is a basic Java code statement, and not a construct, such as a method or inner class as
it was before you converted it to a lambda expression. If you look at Figure 9-12, your event handling code is looking
very clean and well-structured, and yet, in just over a dozen lines of code, it is actually doing quite a lot for your game.
Next, let’s take a look at your import statements code block (especially if you have your import code block
collapsed), since you had NetBeans 8 create lambda expressions for you. Let’s see if you have any unneeded imports!
Optimizing Import Statements: Remove the EventHandler Class Import Statement
Click the + plus icon at the top-left of NetBeans and expand your import statement section and see if you now
have an unused import javafx.event.EventHandler statement with wavy yellow underline warning highlighting
underneath it. I have this, as you can see in Figure 9-13, and when I mouse-over it I get the “Unused Import”
warning message. I used the Alt-Enter work process to bring up the solutions options helper dialog, and sure
enough, there was a “Remove Import Statement” option. So NetBeans will unwrite code for you as well as writing it
for you! Pretty amazing feature!
Figure 9-13. Mouse-over the import EventHandler warning highlight, and display the pop-up “Unused Import” warning
Next, let’s add the traditional ASDW game play key event handling, to give our users an option to use those keys
or to use two hands for their game play! This will show you how to add alternate key mapping support to your existing
event handling code, using only a few more lines of code in the highly efficient switch-case statement.
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