add user interface

src/game/Game.java

+package game;
+
+import java.util.List;
+import java.util.Scanner;
+import java.util.ArrayList;
+
+public class Game {
+	private List<Player> players = new ArrayList<Player>();
+	private Scanner inputReader = new Scanner(System.in);
+	
+	public Game() {}
+	
+	private void enterPlayers(){
+		int newPlayerNumber = 0;
+		
+		while(true) {
+			System.out.format("Number of new players: ");
+			newPlayerNumber = inputReader.nextInt();
+			if (newPlayerNumber > 0 || players.size() != 0) break;
+		}
+		
+		for (int i = 0; i < newPlayerNumber; ++i) {
+			System.out.format("Name of player %d (out of %d): ", i + 1, newPlayerNumber);
+			String name = inputReader.next();
+			players.add(new Player(name));
+		}
+	}
+
+	public Player startSet() {
+		Set newSet = new Set(players);
+		while(!newSet.isOver()) {
+			Player next = newSet.getNextPlayer();
+			System.out.format("%n%s, please enter the point: ", next.getName());
+			newSet.enterPoint(inputReader.nextInt());
+			System.out.format("%s's score table:%n%s%n", next.getName(), newSet.getScoreTable(next));
+		}
+		return newSet.getWinner();
+	}
+	
+	public boolean quitGame() {
+		System.out.println("%nGo on next set? (Type 'quit' to stop)");
+		return inputReader.next().equals("quit");
+	}
+	
+	public static void main (String[] args) {
+		Game game = new Game();
+		while(true) {
+			game.enterPlayers();
+			Player winner = game.startSet();
+			System.out.println("Congratulations " + winner.getName() + "! You win!");
+			
+			if (game.quitGame()) break;
+		}
+	}
+}