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 one21           */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         else40             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=http://www.mamicode.com/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 println51         }52 53          /**54           *question two55           */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 }