使用LinkedList模拟洗牌功能
package cn.itcast.collection; import java.util.LinkedList; import java.util.Random; /*使用LinkedList模拟洗牌功能*/ //扑克牌类 class Poker { String color;// 花色 String num;// 点数 public Poker(String color, String num) { this.color = color; this.num = num; } @Override public String toString() { return "{" + color + num + "}"; } } public class Demo3 { public static void main(String[] args) { LinkedList poker = createPoker(); shufflePoker(poker); showPoker(poker); } // 洗牌功能 public static void shufflePoker(LinkedList poker) { // 创建随机数 Random random = new Random(); for (int i = 0; i < 100; i++) { // 随机产生2个索引值,并交换两张牌的顺序 int index1 = random.nextInt(poker.size()); int index2 = random.nextInt(poker.size()); Poker poker1 = (Poker) poker.get(index1); Poker poker2 = (Poker) poker.get(index2); poker.set(index1, poker2); poker.set(index2, poker1); } } // 生产扑克牌 public static LinkedList createPoker() { String[] strColor = new String[] { "黑桃", "红桃", "梅花", "方块" }; String[] strNum = new String[] { "A", "2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K" }; LinkedList list = new LinkedList(); for (int i = 0; i < strColor.length; i++) { for (int j = 0; j < strNum.length; j++) { list.add(new Poker(strColor[i], strNum[j])); } } return list; } // 显示扑克牌 public static void showPoker(LinkedList list) { for (int i = 0; i < list.size(); i++) { System.out.print(list.get(i)); if (i % 10 == 9) { System.out.println(); } } } }