Java: Programming: Hammurabi II - Two Player Version

// File   : hammurabi0/Hammurabi.java
// Purpose: Starting point for working on the Hammurabi program.
// Author : Fred Swartz
// Date   : 17 Apr 2005

import javax.swing.*;

public class Hammurabi {

    //========================================================= main
    public static void main(String[] args) {

        //... Initialization [TODO: set initial population]
        Kingdom samaria = new Kingdom();  // Create a new
        samaria.setGrain(3000);


        //... Run the simulation for 10 years or until everyone starves.
        //    TODO:
        while (samaria.getYear() <= 5  /* && samaria.getPopulation() > 0 */) {
            displayStatus(samaria);

            //TODO: Ask the Exalted Ruler how much to feed the people.
            int food = 0;  // This is in place of asking for input.

            String plantStr = JOptionPane.showInputDialog(null,
                    "How much of the remaining "
                    + (samaria.getGrain()-food) + " bushels should we plant?");
            int seeds = Integer.parseInt(plantStr);

            //... Update the food and population of this kingdom.
            samaria.simulateOneYear(food, seeds);
        }

        //... Show final state.
        displayStatus(samaria);

    }


    //==================================================== displayStatus
    // Shows the amount of grain and population for
    // and Kingdom.  TODO: Add population output.
    private static void displayStatus(Kingdom country) {
        JOptionPane.showMessageDialog(null,
                "Year = " + country.getYear()
                + "\nGrain = " + country.getGrain());
    }
}

// File   : hammurabi0/Kingdom.java
// Purpose: Represents a "kingdom"
//          This version uses only year and grain.
//          TODO: Add population value and simulation.
// Author : Fred Swartz
// Date   : 17 Apr 2005

class Kingdom {
    //==================================================== Constants
    public static int SEED_REQUIRED_PER_ACRE = 2;

    //=========================================== Instance variables.
    private int myGrain;
    private int myYear = 1;

    //===================================================== setGrain
    public void setGrain(int grain) {
        myGrain = grain;
    }

    //===================================================== getGrain
    public int getGrain() {
        return myGrain;
    }

    //====================================================== getYear
    public int getYear() {
        return myYear;
    }

    //============================================== simulateOneYear
    public void simulateOneYear(int food, int seed) {
        myYear++;

        //TODO: Need to calculate new population.based on food.

        //... Reduce grain stockpile by amount used for food and seed
        myGrain = myGrain - food - seed;

        //... Calculate new harvest
        //    1. How many acres can be planted with seed.
        //    2. The yield per acre is random (2-6)
        //    3. Harvest is number area planted * yield.

        int acresPlanted = seed / SEED_REQUIRED_PER_ACRE;
        int yieldPerAcre = 2 + (int)(5 * Math.random());
        int harvest      = yieldPerAcre * acresPlanted;

        myGrain += harvest;  // New amount of grain in storage.
    }
}