concreteobserver.java

《Java与模式》一书的源代码

package com.javapatterns.observer.imageobserver;

import java.awt.*;
import java.awt.image.ImageObserver;

public class ConcreteObserver implements ImageObserver
{
    public boolean imageUpdate(Image img, int infoflags,
    int x, int y, int width, int height)
    {
        return true;
    }
}