When loading a large image, you may create some light object to represent it until the image is loaded completely.
Usually a proxy object has the same methods as the object it represents.
Once the object is loaded, it passes on the actual object.
For example,
abstract class Graphic {
public abstract void load();
public abstract void draw();
...
}
class Image extends Graphic{
public void load() {
...
}
public void draw() {
...
}
}
class ImgProxy extends Graphic {
public void load() {
if(image == null) {
image = new Image(filename);
}
public void draw() {
...
}
}
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