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Date: Sun, 17 Apr 2011 23:47:41 -0700
From: Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com>
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Subject: Re: Basic prisoner's dilemma?
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On 4/17/11 10:08 PM, theglazeb wrote:
> [...]  how could make it output random
> DEFECT or COOPERATE? and then following on that, how could I start
> thinking about a Tit for Tat strategy?

   class Prisoner
   {
     private java.util.Random _rnd = new java.util.Random();

     public String randomChoice()
     {
       return _rnd.nextBoolean() ? "DEFECT" : "COOPERATE";
     }

     public String titForTat(String opponentsLastChoice)
     {
       return opponentsLastChoice;
     }
   }

Incorporate those "algorithms" into your ArrayList-based code as needed. 
  For example:

   class PDTitForTatStrategy extends PDStrategy
   {
     private Prisoner _prisoner = new Prisoner();

     public String chooseAction(ArrayList<String> myHistory, 
ArrayList<String> oppHistory)
     {
       return _prisoner.titForTat(oppHistory.get(oppHistory.size() - 1));
     }
   }

Or rework the logic so it's all in one class, or whatever you want to do.

Pete