Java Thread Pools and System.in

[OrangeJuicey]

First off if I was going to take input from System.in using a scanner, and I only wanted it to accept the commands cmd:selectItem, cmd:listItem.
Would i use a case statement which then has a default clause throw new exception e. which would be thrown if a command that wasn't recognized was entered.

Secondly if i wanted to implement more commands to work on my Collection<items> such as countItems, this would then lead to a thread being created which will carry out the activity in the background, can someone tell me how to create the threads concurrecntly e.g thread pool?
For example if i wanted to findITEMname. And status was an array in item that contained several names, how would I get round the problem if multiple calls of findITEMname were called.

Any help is greatly appreciated. Peace.

[/dev/null]

Hi, java does not allow you to use Strings within a switch statement. Only primitives types (String is an object. )

As from your other thread, use compareTo (have to be in an if statement block) or, as I said on the other reply, use integers representing the choices and then you can also use switch. (make comparisons a hell of a lot easier too!)

switch (option) {
  case 1: 
    /*whatever*/
  case 2:
    /*whatever*/
  case 3:
    /*whatever*/
  default:
    throw whateverException();
}

To create threads, you can either extend thread (do only if you don't need to extend another class) or implement runnable. You then need to implement run() and start() methods (there may be more abstract ones, I cannot remember, lol). Calling start() will call the run() method.

Not too sure about the multiple calls. I assume each thread would take it's own copy of the array and would run ok (check this!)

[OrangeJuicey]

thanks mate, I think what it needs is a lock so that the 2nd thread only starts running when 1st thread releases the lock .notify and .notifyall commands. Thanks for the help mate.

[blacksheep]

as John says you can't use a string but you can split the first character off and use that - as long as each choice you are trying to use has a different first character (or second etc).

[/dev/null]

or use the hashcode.