• Check if it is empty.
• Check if it contains a certain element.

 Example uses:
  $primes                    -> new int[] {2, 3, 5, 7}
  $list.size($primes)        -> 4
  $list.get($primes, 2)      -> 5
  $list.set($primes, 2, 1)   -> (primes[2] becomes 1)
  $list.get($primes, 2)      -> 1
  $list.isEmpty($primes)     -> false
  $list.contains($primes, 7) -> true

 Example toolbox.xml config (if you want to use this with VelocityView):
 <tool>
   <key>list</key>
   <scope>application</scope>
   <class>org.apache.velocity.tools.generic.ListTool</class>
 </tool>
 

This tool is entirely threadsafe, and has no instance members. It may be used in any scope (request, session, or application).