TextInterface.java

import java.io.*;
import java.util.Random;
import java.util.Scanner;


public class TextInterface {
   enum Player {USER, COMPUTER}
   public static void main(String[] Args) throws IOException{
   Game game = new Game();
   Scanner input = new Scanner(System.in);
   Random rand = new Random();
   Player player;
   if (rand.nextBoolean())
      player = Player.USER;
   else
      player = Player.COMPUTER;
   System.out.print("Welcome to Battleship!\n\n");
   if (player == Player.USER)
      System.out.println("You won the coin toss and get to go first.");
   else
      System.out.println("The computer won the coin toss and gets to go first.");
   while (!game.computerDefeated() && !game.playerDefeated()){
      if (player == Player.USER){
         System.out.print("Your turn: ");
      String entry = input.nextLine().toUpperCase();
      //Validate user input. The user must enter a letter A-J followed by a
      //number 1-10. The loop repeats until the user enters a valid value.
   while (entry.length() < 2 || entry.length() >3 ||
      (entry.charAt(0) < 'A' || entry.charAt(0) > 'J') ||
      (Integer.parseInt(entry.substring(1)) < 1 ||
       Integer.parseInt(entry.substring(1)) > 10))
   {
       System.out.print("Invalid move, try again: ");
       entry = input.nextLine().toUpperCase();
   }
   String sunk = game.makePlayerMove(entry);
   if (sunk != null)
   {
      System.out.println("The Computer says: \"" + sunk + "\"");
   }
   System.out.println(game);
   //The user has completed their turn, so we change the value of player
   //so that the next iteration of this loop will process a move by the
   //computer.
   player = Player.COMPUTER;
   } 
   else
   {
      System.out.println("Computer's turn. Press any key to continue.");
      input.nextLine();
      //We call a Game function which returns a computer move. This allows us
      //to print that move for the user to see.
      String[] result = game.makeComputerMove();
      System.out.println("Computer Chose : " + result[0]);
   if (result[1] != null)
   {
      System.out.println("You spontaneously exclaim: \"" + result[1] +
      "\"");
   }
   System.out.println(game);
   //The computer has completed their turn, so we change the value of player
   //so that the next iteration of
   //this loop will process a move by the computer.
   player = Player.USER;
      }
   }
   System.out.println("Game Over!");
   if (player == Player.USER)
      System.out.println("The Computer wins!");
   else
   {
      System.out.println("You defeated the Computer. That was easy.");
   }
 }
}