小编Vys*_*rem的帖子

我知道抽象类无法实例化.但我对下面的代码有疑问.此代码是android位图趣味演示的一部分(http://commondatastorage.googleapis.com/androiddevelopers/shareables/training/BitmapFun.zip).

// ImageWorkerAdapter class is nested in another abstract class ImageWorker
public static abstract class ImageWorkerAdapter
{
public abstract Object getItem(int num);
public abstract int getSize();
}

//this snippet is seen in Images.java
public final static ImageWorkerAdapter imageWorkerUrlsAdapter = new ImageWorkerAdapter() { 
@Override
public Object getItem(int num) {
return Images.imageUrls[num];
}

我无法理解如何创建抽象类的实例.请帮我理解这段代码.