Collection 層次結構中的根接口。 Collection表示一組對象，這些對像也稱為collection的元素。一些collection 允許有重複的元素，而另一些則不允許。一些collection 是有序的，而另一些則是無序的。 JDK 不提供此接口的任何直接實現：它提供更具體的子接口（如Set 和List）實現。此接口通常用來傳遞collection，並在需要最大普遍性的地方操作這些collection。
主要內容：這裡使用collection集合，模擬香港電影中大佬們玩的撲克牌遊戲。
1、遊戲規則：兩個玩家每人手中發兩張牌，進行比較。比較每個玩家手中牌最大的點數，大小由A-2，點數大者獲勝。如果點數相同，則比較花色，大小由黑(4)、紅(3)、梅(2)、方(1)，花色大者獲勝。
2、實現步驟：
創建一副撲克牌A-2，四種花色黑(4)、紅(3)、梅(2)、方(1)共52張牌；
創建兩個玩家包含玩家ID和姓名、所持牌Card信息；
洗牌並向兩位玩家各發兩張牌；
比較玩家手中牌大小，得出獲勝者；
3、程序實現
牌Card類：包含牌的數字和花色
package collectiontest.games;public class Card { private Integer id; //牌的大小private Integer type;//牌的花色public Card(Integer id, Integer type) { this.id = id; this.type = type; } public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public Integer getType() { return type; } public void setType(Integer type) { this.type = type; } @Override public String toString() { return "Card [id=" + id + ", type=" + type + "]"; } }撲克牌Poker類：包含撲克牌Card A-2
package collectiontest.games;public class Poker { private Card id2 ; private Card id3 ; private Card id4 ; private Card id5 ; private Card id6 ; private Card id7 ; private Card id8 ; private Card id9 ; private Card id10 ; private Card J ; private Card Q ; private Card K ; private Card A ; public Poker() { } //四個類型：黑--4、紅--3、梅--2、方--1 public Poker(Integer type) { this.id2 = new Card(2, type); this.id3 = new Card(3, type); this.id4 = new Card(4, type); this.id5 = new Card(5, type); this.id6 = new Card(6, type); this.id7 = new Card(7, type); this.id8 = new Card(8, type); this.id9 = new Card(9, type); this.id10 = new Card(10, type); this.J = new Card(11, type); this.Q = new Card(12, type); this.K = new Card(13, type); this.A = new Card(14, type); } public Card getId2() { return id2; } public void setId2(Card id2) { this.id2 = id2; } public Card getId3() { return id3; } public void setId3(Card id3) { this.id3 = id3; } public Card getId4() { return id4; } public void setId4(Card id4) { this.id4 = id4; } public Card getId5() { return id5; } public void setId5(Card id5) { this.id5 = id5; } public Card getId6() { return id6; } public void setId6(Card id6) { this.id6 = id6; } public Card getId7() { return id7; } public void setId7(Card id7) { this.id7 = id7; } public Card getId8() { return id8; } public void setId8(Card id8) { this.id8 = id8; } public Card getId9() { return id9; } public void setId9(Card id9) { this.id9 = id9; } public Card getId10() { return id10; } public void setId10(Card id10) { this.id10 = id10; } public Card getJ() { return J; } public void setJ(Card j) { J = j; } public Card getQ() { return Q; } public void setQ(Card q) { Q = q; } public Card getK() { return K; } public void setK(Card k) { K = k; } public Card getA() { return A; } public void setA(Card a) { A = a; }}玩家Player類：包含玩家ID和姓名、所持卡片信息
package collectiontest.games;import java.util.ArrayList;import java.util.List;public class Player { //玩家的ID private String id ; //玩家姓名private String name ; //玩家所持牌private List<Card> pokerType ; public Player() { } public Player(String id, String name, List<Card> pokerType) { this.id = id; this.name = name; this.pokerType = new ArrayList<>(); } public String getId() { return id; } public void setId(String id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public List<Card> getPokerType() { return pokerType; } public void setPokerType(List<Card> pokerType) { this.pokerType = pokerType; } }撲克牌遊戲主類：包含1)撲克牌創建2)玩家創建3)洗牌4)發牌5)比較勝負
package collectiontest.games;import java.util.ArrayList;import java.util.Arrays;import java.util.Collections;import java.util.HashMap;import java.util.HashSet;import java.util.List;import java.util.Map;import java.util.Scanner;import java.util.Set;public class GamsBegin { // 創建撲克牌public Set<Poker> cPoker() { System.out.println("**********開始創建撲克牌**********"); // 創建一副poker // 四個類型：黑--4、紅--3、梅--2、方--1 Set<Poker> pokers = new HashSet<>(); Poker[] poker = { new Poker(1), new Poker(2), new Poker(3), new Poker(4) }; /* * Collections工具類的使用* Collections.addAll(pokers, new Poker(1), new Poker(2), new Poker(3),new Poker(4)); * * */ pokers.addAll(Arrays.asList(poker)); System.out.println("**********撲克牌創建成功**********"); return pokers; } // 創建兩個玩家public Map<String, Player> cPlayer() { System.out.println("**********開始創建玩家**********"); Map<String, Player> map = new HashMap<String, Player>(); // 控制數量Integer control = 0; System.out.println("創建兩名玩家，根據提示創建"); Scanner console = new Scanner(System.in); while (true) { System.out.println("請輸入第"+(control+1)+" 個玩家ID："); String courseId = console.next(); if (isNumeric(courseId)) { System.out.println("請輸入第"+(control+1)+" 個玩家姓名："); String courseName = console.next(); Player players = new Player(courseId, courseName, null); //保存數據map.put(courseId, players); System.out.println("添加第" + (control + 1) + " 個玩家" + courseName + " 成功"); //數量自加control++; } else { System.out.println("*****請輸入數字ID*****"); continue; } if (control == 2) { break; } } System.out.println("**********玩家創建成功**********"); return map; } // 判斷輸入是否為數字, Character.isDigit()為java方法public boolean isNumeric(String str) { for (int i = 0; i < str.length(); i++) { if (!Character.isDigit(str.charAt(i))) { return false; } } return true; } /** * 洗牌：也可以產生52個不同隨機數，實現洗牌* **/ public List<Card> wPoker(Set<Poker> pokers) { System.out.println("**********開始洗牌**********"); //利用List的有序排序，洗牌之後保存順序不變List<Card> listCard = new ArrayList<>(); // 利用Set集合的無序排序，實現洗牌Set<Card> listSet = new HashSet<>(); //保存到Set集合，無序for (Poker pk : pokers) { listSet.add(pk.getId2()); listSet.add(pk.getId3()); listSet.add(pk.getId4()); listSet.add(pk.getId5()); listSet.add(pk.getId6()); listSet.add(pk.getId7()); listSet.add(pk.getId8()); listSet.add(pk.getId9()); listSet.add(pk.getId10()); listSet.add(pk.getJ()); listSet.add(pk.getQ()); listSet.add(pk.getK()); listSet.add(pk.getA()); } //保存在List集合,有序for (Card cd : listSet) { listCard.add(cd); System.out.println(cd); } System.out.println("**********洗牌成功**********"); return listCard; } // 發牌public Map<String, Player> pushPoker(List<Card> listCard, Map<String, Player> pMap) { System.out.println("**********發牌開始**********"); // 控制每人發兩張牌後結束int control = 0; for (Map.Entry<String, Player> entry : pMap.entrySet()) { if (control == 0) { for (int i = 0; i < 3; i = i + 2) { // 發牌entry.getValue().getPokerType().add(listCard.get(i)); } // 更新map對象pMap.put(entry.getKey(), entry.getValue()); control++; } else if (control == 1) { for (int i = 1; i < 4; i = i + 2) { // 發牌entry.getValue().getPokerType().add(listCard.get(i)); } // 更新map對象pMap.put(entry.getKey(), entry.getValue()); control++; } else { break; } } System.out.println("**********發牌成功**********"); return pMap; } public void compareMatch(Map<String, Player> newMap) { /*比較勝負* 1.首先取得每個玩家手中最大牌的ID和花色ID。 * 2.比較倆玩家手中最大牌的ID大小，牌大者獲勝。 * 3.如果兩張牌的ID相等，在比較兩張牌的花色ID，花色ID更大著獲勝。 * * */ List<Player> players = new ArrayList<>(); // 獲得兩個玩家for (Map.Entry<String, Player> entry : newMap.entrySet()) { players.add(entry.getValue()); } // 玩家一信息和所持牌List<Card> playerOne = players.get(0).getPokerType(); //獲得最大牌的ID和花色Integer oneMaxId = Math.max(playerOne.get(0).getId(), playerOne.get(1) .getId()); Integer oneMaxType = (oneMaxId!=playerOne.get(0).getId()) ? playerOne.get(1).getType() : playerOne.get(0).getType() ; // 玩家二信息和所持牌List<Card> playerTwo = players.get(1).getPokerType(); //獲得最大牌的ID和花色Integer twoMaxId = Math.max(playerTwo.get(0).getId(), playerTwo.get(1) .getId()); Integer twoMaxType = (twoMaxId!=playerTwo.get(0).getId()) ? playerTwo.get(1).getType() : playerTwo.get(0).getType() ; if (oneMaxId > twoMaxId) { System.out.println("玩家： " + players.get(0).getName() + " 獲勝！！"); } else if (oneMaxId == twoMaxId) { if (oneMaxType > twoMaxType) { System.out .println("玩家： " + players.get(0).getName() + " 獲勝！！"); } else { System.out .println("玩家： " + players.get(1).getName() + " 獲勝！ ！ "); } } else { System.out.println("玩家： " + players.get(1).getName() + " 獲勝！！"); } System.out.println("**********************************************"); System.out.println("玩家： " + players.get(0).getName() + "的牌是：" + showName(playerOne.get(0).getType(), 0) + "--" + showName(playerOne.get(0).getId(), 1) + " " + showName(playerOne.get(1).getType(), 0) + "--" + showName(playerOne.get(1).getId(), 1)); System.out.println("玩家： " + players.get(1).getName() + "的牌是：" + showName(playerTwo.get(0).getType(), 0) + "--" + showName(playerTwo.get(0).getId(), 1) + " " + showName(playerTwo.get(1).getType(), 0) + "--" + showName(playerTwo.get(1).getId(), 1)); } // 顯示牌的名稱private String showName(Integer i, Integer type) { String str = ""; // 顯示花色if (type == 0) { switch (i) { case 1: { str = "方塊"; break; } case 2: { str = "梅花"; break; } case 3: { str = "紅桃"; break; } case 4: { str = "黑桃"; break; } default: { break; } } } // 顯示數字if (type == 1) { if (i < 11) { return i.toString(); } else { switch (i) { case 11: { str = "J"; break; } case 12: { str = "Q"; break; } case 13: { str = "K"; break; } case 14: { str = "A"; break; } default: { break; } } } } return str; } public static void main(String[] args) { GamsBegin gb = new GamsBegin(); // 1、創建撲克牌Set<Poker> pokers = gb.cPoker(); // 2、創建兩個玩家Map<String, Player> pMap = gb.cPlayer(); // 3、洗牌List<Card> listCard = gb.wPoker(pokers); // 4、發牌Map<String, Player> newMap = gb.pushPoker(listCard, pMap); // 4、比較勝負gb.compareMatch(newMap); }}運行結果：
**********開始創建撲克牌**********
**********撲克牌創建成功**********
**********開始創建玩家**********
創建兩名玩家，根據提示創建請輸入第1 個玩家ID：
請輸入第1 個玩家姓名：
周星馳添加第1 個玩家周星馳成功請輸入第2 個玩家ID：
請輸入第2 個玩家姓名：
周潤發添加第2 個玩家周潤發成功
**********玩家創建成功**********
**********開始洗牌**********
Card [id=9, type=3]
Card [id=11, type=4]
Card [id=13, type=3]
Card [id=8, type=3]
Card [id=5, type=2]
Card [id=6, type=1]
Card [id=4, type=3]
Card [id=5, type=4]
Card [id=2, type=3]
Card [id=9, type=2]
Card [id=9, type=4]
Card [id=14, type=2]
Card [id=9, type=1]
Card [id=2, type=1]
Card [id=2, type=4]
Card [id=7, type=4]
Card [id=11, type=1]
Card [id=10, type=1]
Card [id=14, type=4]
Card [id=14, type=3]
Card [id=12, type=2]
Card [id=2, type=2]
Card [id=10, type=2]
Card [id=7, type=1]
Card [id=7, type=3]
Card [id=8, type=2]
Card [id=4, type=4]
Card [id=13, type=4]
Card [id=14, type=1]
Card [id=12, type=1]
Card [id=5, type=1]
Card [id=6, type=4]
Card [id=12, type=4]
Card [id=11, type=2]
Card [id=10, type=3]
Card [id=3, type=4]
Card [id=12, type=3]
Card [id=4, type=2]
Card [id=4, type=1]
Card [id=6, type=2]
Card [id=5, type=3]
Card [id=8, type=4]
Card [id=3, type=2]
Card [id=13, type=2]
Card [id=7, type=2]
Card [id=3, type=3]
Card [id=3, type=1]
Card [id=6, type=3]
Card [id=8, type=1]
Card [id=11, type=3]
Card [id=13, type=1]
Card [id=10, type=4]
**********洗牌成功**********
**********發牌開始**********
**********發牌成功**********
玩家： 周星馳獲勝！ ！
**********************************************
玩家： 周星馳的牌是：紅桃--9 紅桃--K
玩家： 周潤發的牌是：黑桃--J 紅桃--8
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持武林網。