Images and OO
I am writing a very simple programs which displays a different coloured
target depending on what colour has been selected (using a combo box).
I have an abstract class called Target and three classes called GreenTarget,
RedTarget and YellowTarget which all extend Target.
Each subclass has a method called getColourIndex which returns an integer
relating to the correct coloured target to load in the images array.
To select the colour and return the correct subclass, I have used the
class Test extends Panel implements ActionListener
Choice ch = new Choice();
Button display = new Button("Display");
Image images = new Image;
// Load Images
public void actionPerformed(ActionEvent evt)
colour = ch.getSelectedItem();
t = new RedTarget();
t = new YellowTarget();
t = new GreenTarget();
colourIndex = t.getColourIndex();
public void paint(Graphics g)
How could this code be better? How can I rearrange the code so that I am not
asking for raw data (the image indexes) from the subclasses?
Should I pass the Graphics object in the paint() method to one of the
Also, should the images be loaded in the init() method or should each
subclass load their own image?
I hope someone can help because I am always having this problem.
I have read the MVC pattern but I am finding it hard to understand.
Hope someone can help me
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