一、Collection系列集合的小结
二、补充知识：集合的并发修改异常问题
三、Collection的其他相关知识
1. 前置知识：可变参数
2. 集合的工具类：Collections
3. 综合案例：斗地主游戏
（1）创建Card类
public class Card {private String number;private String color;private int size;public Card() {}public Card(String number, String color, int size) {this.number = number;this.color = color;this.size = size;}public String getNumber() {return number;}public void setNumber(String number) {this.number = number;}public String getColor() {return color;}public void setColor(String color) {this.color = color;}public int getSize() {return size;}public void setSize(int size) {this.size = size;}@Overridepublic String toString() {return color + number;}
}
（2）创建房间类Room
public class Room {private List<Card> allCards = new ArrayList<>();public Room(){String[] numbers = {"3","4","5","6","7","8","9","10","J","Q","K","A","2"};String[] colors = {"♠","♥","♦","♣",};int size = 0;for (String number : numbers) {size ++ ;for (String color : colors) {Card c = new Card(number, color, size);allCards.add(c);}}Card c1 = new Card("","🃏",++size);Card c2 = new Card("","🤡", ++size);Collections.addAll(allCards, c1, c2);System.out.println("新牌"+allCards);}public void start() {//1. 洗牌：allCardsCollections.shuffle(allCards);System.out.println("洗牌后"+allCards);//2. 发牌：定义三个玩家。List<Card> LingHuchong = new ArrayList<>();List<Card> JiuMozhi = new ArrayList<>();List<Card> RenYingying = new ArrayList<>();//正式发牌给三个玩家，每次发出51张牌，剩余3张牌作为底牌for (int i = 0; i < allCards.size() - 3; i++) {Card c = allCards.get(i);if(i % 3 == 0){LingHuchong.add(c);}else if(i % 3 == 1){JiuMozhi.add(c);}else if(i % 3 == 2){RenYingying.add(c);}}//3. 对3个玩家的牌进行排序sortCards(LingHuchong);sortCards(JiuMozhi);sortCards(RenYingying);//4. 看牌System.out.println("阿冲："+LingHuchong);System.out.println("阿鸠："+JiuMozhi);System.out.println("盈盈："+ RenYingying);List<Card> LastThreeCards = allCards.subList(allCards.size()-3, allCards.size());System.out.println("底牌：" + LastThreeCards);//抢到地主的展示JiuMozhi.addAll(LastThreeCards);sortCards(JiuMozhi);//抢到地主之后的牌进行排序System.out.println("阿鸠抢到地主后："+JiuMozhi);}private void sortCards(List<Card> cards) {Collections.sort(cards, new Comparator<Card>() {@Overridepublic int compare(Card o1, Card o2) {return o1.getSize() - o2.getSize();// 升序排序return o2.getSize() - o1.getSize();//降序排序}});}
}
（3）创建游戏测试类 GameDemo
public class GameDemo {public static void main(String[] args) {Room m = new Room();m.start();}
}
（4）运行结果
