我正在进行一项练习,我想在检查它是否在元素列表中之后创建一个更改节点值的方法。我试过这样做是通过创建一个新对象newNode,并使用节点类中的setter方法来更改值,但我没有得到任何结果。我应该如何处理这个问题,以便更好地理解它。谢谢。
链接列表类:
public class DLList<E> implements DLListADT<E> {
private DLNode<E> front; //. This is a reference to the first node of the doubly linked list.
private DLNode<E> rear; //. This is a reference to the last node of the doubly linked list.
private int count; //. The value of this variable is the number of data items in the linked list
public DLList() { // Creates an empty list.
front = null;
rear = null;
count = 0;
/** Changes the value of dataItem to newValue. An InvalidDataItemException is thrown if the given dataItem is not in the list. */
public void changeValue (E dataItem, int newValue) throws InvalidDataItemException {
if (front == null) {
throw new InvalidDataItemException("The specified element is not in the priority queue");
DLNode<E> newNode = new DLNode<E>(dataItem, newValue);
newNode.setData(dataItem);
newNode.setValue(newValue);
}
我很确定你想要做的是浏览链表,直到找到匹配的节点并修改该节点
DLNode<E> newNode == front;
while(newNode.getNext() != null){
newNode = newNode.getNext();
if(newNode.getData().equals(dataItem)){
newNode.setValue(newValue);
break;
}
}