java - Stuck on the prisoner dilema -

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i have classic prisoner's dilema java code.

here instructions:

table:

  1. ask user input going do: stay silent or betray. must use joptionpane drop down lists.

  2. look , use java random number generator determine friend going do.

  3. print message showing results. results include each of did (stayed silent or betrayed) , sentence each person. message should sentence or more – no codes s or b actual words.

  4. use joptionpane input , output

this have far:

import javax.swing.*;  public class rich04 {   public static void main (string[] args)     {      string[] ddlist = {"betray", "stay silent"};      object selectedvalue;       int code;      selectedvalue = joptionpane.showinputdialog(                 null,                 "choose one",                   "prisoner's dilema",                                        joptionpane.question_message,                         null,                                        ddlist,                                 ddlist[1]);                   (int i=0; i<ddlist.length; i++)         if (ddlist[i].equals(selectedvalue))              joptionpane.showmessagedialog(                 null,                 "the user selected " + ddlist[i],                 "decision",                 joptionpane.information_message);   }  }

i know it's not lot i'm @ loss next

note payoff table 2x2 array. store result of game in each of cells. retrieve user's choice , friend's choice 0 (silent) or 1 (betray). these indexes 2x2 array. finally, use indexes result:

import java.util.random; import javax.swing.*;  public class rich04 {     public static void main (string[] args)       {          string[] ddlist = {"silent", "betray"};          string[][] sentencematrix = {                  {"both players chose remain silent. both 1 year", "you stayed silent. friend betrayed. 5 you; 0 friend"},                 {"you betrayed. friend stayed silent. 0 you; 5 friend", "both players betrayed. both 3 years"}         };            //get user's choice         object selectedvalue = joptionpane.showinputdialog(                 null,                 "choose one",                   "prisoner's dilema",                                  joptionpane.question_message,                   null,                                  ddlist,                                 ddlist[1]);         int mychoicenum = 0;         if (((string)selectedvalue).equalsignorecase("silent"))             mychoicenum = 0;         else             mychoicenum = 1;          //get friend's choice         random rand = new random();         int friendchoicenum = rand.nextint(2);         string sentence = sentencematrix[mychoicenum][friendchoicenum];          //output result         joptionpane.showmessagedialog(                 null,                 sentence,                 "decision",                 joptionpane.information_message);     } }

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