Using EL variable as index into another EL object?

[John Wallace]

Here is what I can do in a JSP using EL:

 
<p>
IP is: ${computer_system[1].IPAddress}
</p>

...but i would like to do it in this way (which is in error):

 
<p>
IP is: ${computer_system[${system_index}].IPAddress}
</p>

Where the code in the servlet reads:

HttpSession session = request.getSession();
 
ComputerSystem[] cs = new ComputerSystem[5];
cs[0] = new ComputerSystem();
cs[0].setIPAddress ("127.0.0.1");
cs[1] = new ComputerSystem();
cs[1].setIPAddress ("64.233.179.99");
 
session.setAttribute ("computer_system", cs);
session.setAttribute ("system_index", 1);

and ComputerSystem.java contains:

public class ComputerSystem {
   private String ipAddress;
   public void setIPAddress (String ip) { ipAddress = ip; }
   public String getIPAddress () { return ipAddress; }
}

My question is this: What is the correct way to do what I want to do using EL?

Thanks,
[ May 03, 2006: Message edited by: John Wallace ]

[Ben Souther]

EL questions do better in the JSP forum.

[Bear Bibeault]

<p>
IP is: ${computer_system[system_index].IPAddress}
</p>    

The ${} is not a "fetch" operator. It surrounds the entire EL expression.