拿java写了一个有点像指针的单链表

public class LinkList {
 private Node firstNode;
 private Integer position;

public LinkList() {
  super();
 }

public LinkList(Node firstNode) {
  super();
  this.firstNode = firstNode;
 }

public Node getFirstNode() {
  return firstNode;
 }

public void setFirstNode(Node firstNode) {
  this.firstNode = firstNode;
 }

public Integer getPosition() {
  return position;
 }

public void setPosition(Integer position) {
  this.position = position;
 }

/**
  * 无位置参数:在链表的末尾添加
  *
  * @param node
  * @return
  */
 public LinkList add(Node node) {
  // 从头结点开始，依次找下去知道为空为止
  Node currentNode = this.firstNode;
  if (firstNode.getNextNode() == null) {
   node.setPriorNode(firstNode);
   firstNode.setNextNode(node);
   return this;
  }
  while (currentNode.getNextNode() != null) {
   currentNode = currentNode.getNextNode();
  }
  currentNode.setNextNode(node);
  currentNode.getPriorNode().setNextNode(currentNode);
  node.setPriorNode(currentNode);
  return this;
 }

/**
  * 在指定位置添加节点
  *
  * @param node
  * @param position
  * @return
  */
 public boolean add(Node node, int position) {
  int count = 0;
  Node currentNode = this.firstNode;
  if (position == 1) {
   if (firstNode.getNextNode() == null) {
    node.setPriorNode(firstNode);
    firstNode.setNextNode(node);
    return true;
   }
   node.setNextNode(firstNode.getNextNode());
   node.setPriorNode(firstNode);
   firstNode.setNextNode(node);
   return true;
  }
  while (count < position) {
   if (currentNode.getNextNode() == null) {
    if (count == position - 1) {
     add(node);
     return true;
    }
    return false;
   }
   currentNode = currentNode.getNextNode();
   count++;
  }
  currentNode.getPriorNode().setNextNode(node);
  node.setPriorNode(currentNode.getPriorNode());
  node.setNextNode(currentNode);
  currentNode.setPriorNode(node);
  node.setPriorNode(currentNode);
  return true;
 }

/**
  * 移除指定位置的node
  *
  * @param position
  * @return
  */
 public boolean remove(int position) {
  Node canditate = find(position);
  if (canditate != null && canditate.getNextNode() != null) {
   canditate.getPriorNode().setNextNode(canditate.getNextNode());
   canditate.getNextNode().setPriorNode(canditate.getPriorNode());
  } else if (canditate != null && canditate.getNextNode() == null) {
   canditate.getPriorNode().setNextNode(null);
  } else {
   return false;
  }

return true;
 }

/**
  * 根据指定位置查找node
  *
  * @param position
  * @return
  */
 public Node find(int position) {
  int count = 0;
  Node node = this.firstNode;
  while (count < position) {
   if (node.getNextNode() != null) {
    node = node.getNextNode();
   }
   if (node.getNextNode() == null && count < position - 1) {
    return null;
   }
   count++;
  }
  return node;
 }

/**
  * 根据位置更新node信息
  *
  * @param newvalue
  * @param position
  * @return
  */
 public boolean update(String newvalue, int position) {
  Node canditate = find(position);
  if (canditate != null) {
   canditate.setNodevalue(newvalue);
  } else {
   return false;
  }

return true;
 }
}

package projectlinklist;

/**
 *实体类
 *nodevalue为节点的值
 *nextNode为下一个节点
 */
public class Node {
  private Node priorNode;
  public Node getPriorNode() {
   return priorNode;
  }
  public void setPriorNode(Node priorNode) {
   this.priorNode = priorNode;
  }
  private String nodevalue;
  private Node nextNode;
  public String getNodevalue() {
   return nodevalue;
  }
  public Node(String nodevalue) {
   super();
   this.nodevalue = nodevalue;
  }
  public Node() {
   super();
  }
  public void setNodevalue(String nodevalue) {
   this.nodevalue = nodevalue;
  }
  public Node getNextNode() {
   return nextNode;
  }
  public void setNextNode(Node nextNode) {
   this.nextNode = nextNode;
  }
}