[JAVA][Beginning Java 8 Games Development]

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Chapter 10 ■ Directing the Cast of Actors: Creating a Casting Director Engine and Creating the Bagel Actor Class Figure 10-11. Use Alt-Enter, and have NetBeans write your CastingDirector() constructor method Java code for you We should probably create at least one Actor class (object) for our game’s star character, the InvinciBagel himself, before we close out this chapter. Let’s use our Hero abstract class to create a Bagel class so that later we can create an iBagel object. We will use this code in the next chapter, where we will learn how to move this InvinciBagel character around the Stage, as well as optimizing the structure of our InvinciBagel.java class a bit more as well. Creating Our Main Actor: The Bagel Hero Subclass Let’s create a Bagel.java class by right-clicking on the invincibagel package folder in the NetBeans Projects pane on the left side of the IDE, and select the New ➤ Java Class menu sequence to bring up the New Java Class dialog, shown in Figure 10-12. Name the class Bagel and accept the other default Project, Location, Package and Created File option fields, by clicking on the Finish button, which will create the new Bagel.java class, and open it up in a tab in NetBeans. www.it-ebooks.info 223
Chapter 10 ■ Directing the Cast of Actors: Creating a Casting Director Engine and Creating the Bagel Actor Class Figure 10-12. Use the New Java Class dialog and create the Bagel.java class in the invincibagel package The first thing that you will want to do is to add the Java extends keyword to the end of your public class Bagel {...} class declaration statement that NetBeans wrote for you, so that your Bagel class inherits all of the power (variables and methods) from the Hero class that we created back in Chapter 8. The Java code for this currently empty class should look like the following: package invincibagel; public class Bagel extends Hero { // an empty class structure } The first thing that we will want to write is the Bagel() constructor method, since we want to create a Bagel character to place onto the screen so that we can start to work on movement code, and later collision code. This code will take in the same exact parameters that the Hero class Hero() constructor method needs to receive, and will pass them “up” to the Hero class Hero() constructor using the Java super keyword (I like to call this a super constructor) in the form of a super() constructor method call. Your Java code for this Bagel() constructor method should look just like the following Java class and constructor method structure: public class Bagel extends Hero { public Bagel(String SVGdata, double xLocation, double yLocation, Image... spriteCels) { super(SVGdata, xLocation, yLocation, spriteCels); } } As you can see in Figure 10-13, there is a wavy red error underline highlight, under the Bagel class name. If you mouse-over this you will see the “Bagel is not abstract and does not override abstract method .update() in Hero,” which tells you that you either need to make Bagel a public abstract class, which we are not going to do because we wish to actually use this class to hold a character (object) and its attributes (variables) and capabilities (methods), so the other option to eliminate this error is to add in your @Override public void update() {...} method structure, even if it is an empty method for now. 224 www.it-ebooks.info
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Contents at a Glance About the Auth
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Introduction The Java Programming L
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■ Introduction In Chapter 13 you
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Chapter 1 ■ Setting Up a Java 8 G
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Chapter 2 Setting Up Your Java 8 ID
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Chapter 2 ■ Setting Up Your Java
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Profiling Your Java 8 Game Applicat
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Chapter 3 ■ A Java 8 Primer: An I
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Chapter 5 An Introduction to Game D
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Chapter 5 ■ An Introduction to Ga
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Chapter 6 The Foundation of Game De
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Chapter 6 ■ The Foundation of Gam
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Chapter 8 Creating Your Actor Engin
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Chapter 8 ■ Creating Your Actor E
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Chapter 13 ■ Animating Your Actio
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Chapter 14 ■ Setting Up the Game
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Chapter 15 Implementing Game Audio
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Chapter 15 ■ Implementing Game Au
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Chapter 16 ■ Collision Detection:
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Chapter 17 Enhancing Game Play: Cre
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Chapter 17 ■ Enhancing Game Play:
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■ index Background image (cont.)
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■ index InvinciBagel animation (c
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■ index Modifier keywords access
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Beginning Java 8 Games Development
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This Java 8 Game Development book i
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■ Contents NetBeans 8.0 Is User I
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■ Contents ■■Chapter 5: An In
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■ Contents Creating a Hero Superc
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■ Contents Organizing the .update
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■ Contents Optimizing the Scene G
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About the Author Wallace Jackson ha
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Acknowledgments I would like to ack
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