我有一个通用类,它将一个对象和一个顺序捆绑在一起:
public class OrderedObject<T> {
private int order;
private T object;
public OrderedObject(int order, T object) {
this.order = order;
this.object = object;
}
public int getOrder() {
return order;
}
public T getObject() {
return object;
}
}
我开发了一个Set
实现,它存储OrderedObject<T>
实例并想要生成一个Iterator<T>
,按照内置顺序进行枚举:
public class OrderedObjectSet<T> extends AbstractSet<T> implements Set<T> {
Set<OrderedObject<T>> s = new HashSet<OrderedObject<T>>();
public boolean add(int order, T object) {
return s.add(new OrderedObject<T>(order, object));
}
public Iterator<T> iterator() {
return new OrderedObjectSetIterator<T>();
}
public int size() {
return s.size();
}
private class OrderedObjectSetIterator<T> implements Iterator<T> {
private int index;
public boolean hasNext() {
return index < s.size();
}
public T next() {
T object = null;
for (Iterator<OrderedObject<T>> it = s.iterator(); it.hasNext(); ) {
OrderedObject<T> o = it.next();
if (o.getOrder() == index) {
object = o.getObject();
}
}
index++;
return object;
}
public void remove() {
throw new UnsupportedOperationException();
}
}
}
后面的这个类无法编译,因为在Iterator
初始化时存在类型混淆。
for (Iterator<OrderedObject<T>> it = s.iterator(); it.hasNext(); ) {
我忽略了什么?
TreeSet
,对吗? - Michael Myers