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Java code:

class List<T extends ListNode> {

/**
*´øÍ·½ÚµãµÄlist£¬Í·½ÚµãûÓÐÓÃÓÚ´æ·ÅÊý¾Ý
*/
T head;
T current;
T prior;
T last; //Ö¸Ïò×îºóµÄÔªËØ
public List(T headnode){//´«ÈëÍ·½Úµã£¬µÚ¶þ¸ö½Úµã²ÅÊÇÕæÕýµÄÊý¾Ý¿ªÊ¼
head = headnode;
current = head;
prior = head;
last = head;
}

public boolean isEmpty(){
return head == last ? true: false;
}
public boolean isStartOfList(){
return current == head ? true : false;
}
public boolean isEndOfList(){
return current == null ? true:false;
}
public boolean isPriorNullErr(){
return prior == null ? true : false;
}
public T hasNext(){

if(isEmpty() || isEndOfList() || isPriorNullErr()){
return null;
}
else{
if(!isStartOfList() || current != prior){
prior = current;
}
current = (T) current.getNext();//ºóÒÆÖ¸ÕëÔÙ·µ»Ø £¬ÒòΪlist´øÍ·½Úµã
return current;
}
}

public boolean removeCurrent(){

if(this.isEndOfList() || isPriorNullErr()){
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