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;
}
}