0926-----homework

Posted 2020-08-11 风林山火

 1 /**
 2   *homework0926
 3   *@author:kai li
 4   */
 5 package com.kai.li.homework0926;
 6 import java.util.List;
 7 import java.util.ArrayList;
 8 import java.util.Arrays;
 9 import java.util.HashMap;
10 import java.util.Map;
11 import java.util.Scanner;
12 import java.util.Random;
13 /**
14   *following class is client 
15   */
16 public class HomeWork0926{
17     public static void main(String[] args)throws Exception{
18         
19         /**
20           *question one
21           */
22 
23         /*create data source*/
24 
25         List<String> keyList=Arrays.asList("1930","1934","1938","1950","1954","1958","1962","1966","1970","1974","1978","1982","1986","1990","1994","1998","2002","2006","2010","2014");
26         List<String> valueList=Arrays.asList("乌拉圭","意大利","意大利","乌拉圭","西德","巴西","巴西","英格兰","巴西","西德","阿根廷","意大利","阿根廷","西德","巴西","法国","巴西","意大利","西班牙","德国");
27         Map<String,String> footballMap=new HashMap<>();
28         for(int i=0;i<keyList.size();i++){
29             footballMap.put(keyList.get(i),valueList.get(i));
30         }
31 
32         /*query with years*/
33          
34         System.out.print("请输入年份：");    
35         Scanner scanner=new Scanner(System.in);
36         String strKey=scanner.nextLine();
37         if(!footballMap.containsKey(strKey))
38             System.out.println("没有举办世界杯");
39         else
40             System.out.println("世界杯冠军是： "+footballMap.get(strKey));
41 
42         /*query with countrys */
43         
44         System.out.print("请输入国家名称：");
45         String strValue=scanner.nextLine();
46         if(!footballMap.containsValue(strValue))
47             System.out.println(strValue+"没有得过世界杯的冠军");
48         else{
49             System.out.println(strValue+"得冠军年份是：");
50             footballMap.keySet().stream().filter(i->strValue.equals(footballMap.get(i))).sorted().forEach(System.out::println);    //filter the data then sorted then println
51         }
52 
53          /**
54           *question two
55           */
56 
57         /*create data source*/
58 
59         List<String> footballTeam=Arrays.asList("科特迪瓦队","阿根廷队","澳大利亚队","塞尔维亚队","荷兰队","尼日利亚队","日本队","美国队","中国队","新西兰队","巴西队","比利时队","韩国队","喀麦隆队","洪都拉斯队","意大利队");
60         List<ArrayList<String>> footballTeams=new ArrayList<ArrayList<String>>();
61     footballTeams=Arrays.asList(new ArrayList<String>(),new ArrayList<String>(),new ArrayList<String>(),new ArrayList<String>());
62 
63         /*create array of diffrent random number*/
64 
65         int[] randomArray=new int[16];
66         Random random=new Random();
67         for(int i=0;i<randomArray.length;i++){
68             int r;
69             r=random.nextInt(16);
70             randomArray[i]=r;
71             for(int j=0;j<i;j++){
72                     if(r==randomArray[j]){
73                         i--;
74                         break;
75                     }
76                }
77         }
78 
79         /*grouping*/
80     
81         for(int i=0;i<4;i++){
82             for(int j=i*4;j<(i+1)*4;j++){
83                     footballTeams.get(i).add(footballTeam.get(randomArray[j]));
84                }
85         }
86         System.out.println(footballTeams);
87     }
88 }