Java学习之利用集合发牌小练习

 1 package com.swust.集合;
 2 
 3 import java.util.ArrayList;
 4 import java.util.Collections;
 5 import java.util.HashMap;
 6 import java.util.List;
 7 import java.util.Map;
 8 import java.util.Set;
 9 import java.util.TreeSet;
10 
11 public class Example4 {
12     public static void main(String[] args) {
13         puKe();
14     }
15     public static void puKe(){
16         /**
17          * 装牌
18          */
19         String[] strings = {"♦","♣","♠","♥"};
20         String[] number ={"3","4","5","6","7","8","9","10","J","Q","K","A","2"};
21         Map<Integer,String> map = new HashMap<Integer,String>();
22         List<Integer> newList = new ArrayList<Integer>();
23         int index = 0;
24         /**
25          * 错误原因：未考虑牌数递增情况，自始至终只有十三张牌
26          */
27         for(String var : number){
28             for(String color : strings){
29                 String string = color.concat(var);
30                 map.put(index, string);
31                 newList.add(index);
32                 index++;
33             }
34         }
35         map.put(index, "小王");
36         newList.add(index);
37         index++;
38         map.put(index, "大王");
39         newList.add(index);
40         index++;
41         
42         /**
43          * 洗牌
44          */
45         Collections.shuffle(newList);
46         
47         /**
48          * 发牌 
49          */
50         Set<Integer> seta = new TreeSet<Integer>();
51         Set<Integer> setb = new TreeSet<Integer>();
52         Set<Integer> setc = new TreeSet<Integer>();
53         Set<Integer> setd = new TreeSet<Integer>();
54         
55         for(int i=0;i<newList.size();i++){
56             if(i>=newList.size()-3){
57                 setd.add(newList.get(i));
58             }else if(i%3==0){
59                 seta.add(newList.get(i));
60             }else if(i%3==1){
61                 setb.add(newList.get(i));
62             }else if(i%3==2){
63                 setc.add(newList.get(i));
64             }
65         }
66 
67         lookUp(map,setb);
68     }
69     public static void lookUp(Map<Integer,String> map,Set<Integer> set){
70         for(Integer var : set){
71             System.out.print(map.get(var)+" ");
72         }
73     }
74 }