您可以通过以下方式扩展ModifiableObservableListBase
,这是集合的基础,由 返回FXCollections.observableList
:
public class ObservableLimitedList<T> extends ModifiableObservableListBase<T> {
private LinkedList<T> list;
private int maxSize;
public ObservableLimitedList(int maxSize) {
this.maxSize = maxSize;
list = new LinkedList<>();
}
@Override
public boolean add(T element) {
boolean result = super.add(element);
if (size() > maxSize) {
remove(0);
}
return result;
}
// delegate overrides:
@Override
public T get(int index) {
return list.get(index);
}
@Override
public int size() {
return list.size();
}
@Override
protected void doAdd(int index, T element) {
list.add(index, element);
}
@Override
protected T doSet(int index, T element) {
return list.set(index, element);
}
@Override
protected T doRemove(int index) {
return list.remove(index);
}
}
这是此实现的测试:https ://ideone.com/MMhnS6