关于List用法的一个小程序

import java.util.*;public class Deal {    public static void main(String[] args) {        if (args.length < 2) {            System.out.println("Usage: Deal hands cards");            return;        }        int numHands = Integer.parseInt(args[0]);        int cardsPerHand = Integer.parseInt(args[1]);            // Make a normal 52-card deck.        String[] suit = new String[] {            "spades", "hearts",             "diamonds", "clubs"         };        String[] rank = new String[] {            "ace", "2", "3", "4",            "5", "6", "7", "8", "9", "10",             "jack", "queen", "king"         };        List<String> deck = new ArrayList<String>();        for (int i = 0; i < suit.length; i++)            for (int j = 0; j < rank.length; j++)                deck.add(rank[j] + " of " + suit[i]);            // Shuffle the deck.       Collections.shuffle(deck);            if (numHands * cardsPerHand > deck.size()) {            System.out.println("Not enough cards.");            return;        }            for (int i = 0; i < numHands; i++)            System.out.println(dealHand(deck, cardsPerHand));    }      public static <E> List<E> dealHand(List<E> deck, int n) {        int deckSize = deck.size();        List<E> handView = deck.subList(deckSize - n, deckSize);        List<E> hand = new ArrayList<E>(handView);        handView.clear();        return hand;    }}