userinfolist.java

多人聊天室源代码 一个服务器 多人进入

//UserInfoList 类
import javax.swing.*;
import java.net.*;
import java.io.*;

public class UserInfoList
{
	Node root;
	Node pointer;
	int count;
	
	public UserInfoList()
	{
		root = new Node();
		root.next = null;
		pointer = null;
		count = 0;
	}
	
	public void add(Node n)
	{
		pointer = root;
		while(pointer.next != null)
		{
			pointer = pointer.next;
		}
		pointer.next = n;
		n.next = null;
		count++;
	}
	
	public void del(Node n)
	{
		pointer = root;
		while(pointer.next != null)
		{
			if(pointer.next == n)
			{
				pointer.next = n.next;
				count--;
				break;
			}
			pointer = pointer.next;
		}
	}
	
	public int getCount()
	{
		return count;
	}
	
	public Node find(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;
	}
	
	public Node find(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;
	}
}