drawpile.java

来自「一些JAVA的小程序」· Java 代码 · 共 41 行

// CS 582 - Fall 1996 - OSU
// Jean-Guy Speton

import java.util.*;

public class DrawPile extends Pile
{
  public DrawPile()
  {
    for (int i = 0; i < Card.NUM_CARDS; i++) {
      addCard(new Card(i));
    }
    shuffle();
  }

  public Card drawTopCard()
  {
    if (size() > 0) {
      return removeCardAt(0);
    }
    else {
      return null;
    }
  }

  public void shuffle()
  {
    Vector v = new Vector(cards.size());
    Random rand = new Random();

    while (cards.size() > 0) {
      int i = Math.abs(rand.nextInt()) % cards.size();
      Object o = cards.elementAt(i);
      cards.removeElementAt(i);
      v.addElement(o);
    }

    cards = v;
  }
}