HW 3 Solution

Below is my Zuckerville implementation:

import java.util.Scanner;

/** 
 * Zuckerville: a game where the only winner is the one who didn't play.
 * 
 * @author Jose M Vidal 
 *
 */

public class Zuckerville {

 public final static int TIME_TO_HARVEST = 10; //in ticks

 public final static int COST_OF_FERTILIZER = 4; //in zuckerdollars

 public static void main(String[] args) {
  int money = 5; //the amount of "money" the player starts with
  int seeds = 0;
  int plot = 0; //the number of seeds in the plot
  int timeToHarvest = 0; //the time left before the plants get harvested
  int time = 0;
  boolean isFertilized = false; //whether or not the plot has been fertilized
  Scanner keyboard = new Scanner(System.in);
  String command;
  System.out.println("Welcome to Zuckerville, where the only way to win is not to play!");
  System.out.println("We gave you $" + money + " zuckerdollars to get you started! Now go plant!"); //first one's always free
  System.out.println(""); 
  do {
   System.out.print("[" + time + " $" + money + "] Command: ");
   command = keyboard.nextLine();
   int spaceIndex = command.indexOf(' ');
   if (command.startsWith("deposit")) {
    int dollarIndex = command.indexOf('$');
    int deposit = Integer.parseInt(command.substring(dollarIndex + 1));
    money += deposit;
    System.out.println("You now have $" + money);
   }
   else if (command.startsWith("buy")) {
    int amountToBuy = Integer.parseInt(command.substring(spaceIndex + 1));
    if (amountToBuy <= money ) {
     System.out.println("You bought " + amountToBuy + " seeds.");
     seeds += amountToBuy;
     money -= amountToBuy;
    }
    else {
     System.out.println("Sorry, you don't have enough zuckerdollars.");
    }
   }
   else if (command.startsWith("plant")) {
    if (plot != 0) {
     System.out.println("Sorry, there are already seeds planted there. You must wait till after harvest.");
    }
    else {
     for (int i = 0; i < seeds; i++) {
      System.out.println("Planted a seed.");
     }
     plot = seeds;
     seeds = 0;
     timeToHarvest = TIME_TO_HARVEST;
    }
   }
   else if (command.startsWith("fertilize")) {
    if (money < COST_OF_FERTILIZER) {
     System.out.println("Sorry, it costs $" + COST_OF_FERTILIZER + " to buy fertilizer.");}
    else {
     System.out.println("You fertilized your plot!");
     isFertilized = true;
     money -= COST_OF_FERTILIZER;
    }
   }
   else if (!command.startsWith("quit")) {
    System.out.println("What did you say?");
   }
   time++;
   timeToHarvest -= (isFertilized) ? 2 : 1;
   if (timeToHarvest <= 0 && plot != 0) { //Harvest the flowers if the time has come.
    for (int i =0; i < plot; i++) {
     System.out.println("You harvested a beautiful flower.");
    }
    isFertilized = false; //easy to forget this one
    plot = 0;
   }
  } while (!command.equals("quit"));
  System.out.println("Goodbye!");
 }
}