java 推聊天室
/**
 * 用户链表
 */
public class UserLinkList {
 Node root;
 Node pointer;
 int count;
 
 /**
  * 构造用户链表
  */
 public UserLinkList(){
  root = new Node();
  root.next = null;
  pointer = null;
  count = 0;
 }
 
 /**
  * 添加用户
  */
 public void addUser(Node n){
  pointer = root;
  
  while(pointer.next != null){
   pointer = pointer.next;
  }
  
  pointer.next = n;
  n.next = null;
  count++;
  
 }
 
 /**
  * 删除用户
  */
 public void delUser(Node n){
  pointer = root;
  
  while(pointer.next != null){
   if(pointer.next == n){
    pointer.next = n.next;
    count --;
    
    break;
   }
   
   pointer = pointer.next;
  }
 }
 
 /**
  * 返回用户数
  */
 public int getCount(){
  return count;
 }
 
 /**
  * 根据用户名查找用户
  */
 public Node findUser(String username){
  if(count == 0) return null;
  
  pointer = root;
  
  while(pointer.next != null){
   pointer = pointer.next;
   
   if(pointer.username.equalsIgnoreCase(username)){
    return pointer;
   }
  }
  
  return null;
 }
 
 /**
  * 根据索引查找用户
  */
 public Node findUser(int index){
  if(count == 0) {
   return null;
  }
  
  if(index <  0) {
   return null;
  }
  
  pointer = root;
  
  int i = 0;
  while(i < index + 1){
   if(pointer.next != null){
    pointer = pointer.next;
   }
   else{
    return null;
   }
   
   i++;
  }
  
  return pointer;
 }
}

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