Java grab data from a specific arraylist, by entering the name?

Question

Let's say you have an array like this:

protected ArrayList<String> client = new ArrayList<String>();

And then you do this:

client.add(ip, username);

What I am trying to do is, grab the username, using the IP. I only have the IP, I don't have the username, and therefore I need to use the IP to grab the username.

The IP is unique, can't have the same ip in the same array.

How can I use the IP to get the username?

"Get out the map...."

jahroy
– jahroy

2013-08-08 22:51:38 +00:00
Commented Aug 8, 2013 at 22:51 — jahroy
– jahroy, Commented Aug 8, 2013 at 22:51

Luiggi Mendoza · Accepted Answer · 2013-08-08 22:55:23Z

6

You should use a Map with String key and value instead, and use the ip as key. A basic example:

Map<String, String> clients = new HashMap<String, String>();

//fill the map...
String ip = "127.0.0.1";
String name = "luiggi";
clients.put(ip, name);

//get the username by ip
System.out.println(clients.get(ip));

edited Aug 8, 2013 at 22:55

answered Aug 8, 2013 at 22:45

Luiggi Mendoza

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