英文:
LinkedList issues
问题
我正在尝试创建一个名为MyLinkedList的类，它是一个单向链表，非循环列表，每个节点只有一个下一个链接，列表有一个头部链接和一个尾部链接。该类还应实现可迭代接口。我遇到的问题是在addFirst和addEnd中，我遇到了一个错误，错误消息是无法找到符号 - 变量list。我不知道为什么会出现这个错误，因为这种布局对于ArrayList是有效的。public class MyLinkedList<E extends Comparable<E>> extends LinkedList implements Iterable {LinkedList<E> list = new LinkedList<E>();public static void main(String args[]) {LinkedList<E> list = new LinkedList<E>();}public Iterator<E> iterator() {// 实现迭代器接口的代码}public void addFirst(E value) {list.addFirst(value);}public void addEnd(E value) {list.add(value);}}
英文:
I am trying to create a MyLinkedList class that is a singly linked, non-circular list where each node only has one link next and the list has a head and a tail link. The class is also supposed to implement an iterable interface. I am encountering an issue wherein addFirst and addEnd I get an error of cannot find symbol - variable list. I don't know why this error is occurring as this layout worked for ArrayLists.
public class MyLinkedList<E extends Comparable<E>> extends LinkedList implements Iterable{public void main(String args[]){LinkedList<E> list = new LinkedList<E>();}public Iterator iterator(){}public void addFirst(E value){list.addFirst(value);}public void addEnd(E value){list.add(value);}}
答案1
得分: 1
似乎您正在尝试为一个LinkedList<E> list实现一个包装器，该包装器应该是您的类中的一个字段，并将调用委托给这个字段。
public class MyLinkedList<E extends Comparable<E>> extends LinkedList implements Iterable {private LinkedList<E> list = new LinkedList<>();@Overridepublic Iterator iterator() {return list.iterator();}public void addFirst(E value) {list.addFirst(value);}public void addEnd(E value) {list.add(value);}}
英文:
It seems that you you try to implement a wrapper for a LinkedList<E> list which should be a field in your class and delegate calls to this field.
public class MyLinkedList<E extends Comparable<E>> extends LinkedList implements Iterable {private LinkedList<E> list = new LinkedList<>();@Overridepublic Iterator iterator() {return list.iterator();}public void addFirst(E value) {list.addFirst(value);}public void addEnd(E value) {list.add(value);}}
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