0926-----homework（2）

/**
  *homework0926
  *@author:kai li
  */
package com.kai.li.homework0926;
import java.util.List;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
import java.util.Random;
/**
  *following class is client 
  */
public class HomeWork0926{
    public static void main(String[] args)throws Exception{
        
        /**
          *question one
          */

        /*create data source*/

        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");
        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");
        Map<String,String> footballMap=new HashMap<>();
        for(int i=0;i<keyList.size();i++){
            footballMap.put(keyList.get(i),valueList.get(i));
        }

        /*query with years*/
         
        System.out.print("请输入年份：");    
        Scanner scanner=new Scanner(System.in);
        String strKey=scanner.nextLine();
        if(!footballMap.containsKey(strKey))
            System.out.println("没有举办世界杯");
        else
            System.out.println("世界杯冠军是： "+footballMap.get(strKey));

        /*query with countrys */
        
        System.out.print("请输入国家名称：");
        String strValue=scanner.nextLine();
        if(!footballMap.containsValue(strValue))
            System.out.println(strValue+"没有得过世界杯的冠军");
        else{
            System.out.println(strValue+"得冠军年份是：");
            footballMap.keySet().stream().filter(i->strValue.equals(footballMap.get(i))).sorted().forEach(System.out::println);    //filter the data then sorted then println
        }

         /**
          *question two
          */

        /*create data source*/

        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");
        List<ArrayList<String>> footballTeams=new ArrayList<ArrayList<String>>();
    footballTeams=Arrays.asList(new ArrayList<String>(),new ArrayList<String>(),new ArrayList<String>(),new ArrayList<String>());

        /*create array of diffrent random number*/

        int[] randomArray=new int[16];
        Random random=new Random();
        for(int i=0;i<randomArray.length;i++){
            int r;
            r=random.nextInt(16);
            randomArray[i]=r;
            for(int j=0;j<i;j++){
                    if(r==randomArray[j]){
                        i--;
                        break;
                    }
               }
        }

        /*grouping*/
    
        for(int i=0;i<4;i++){
            for(int j=i*4;j<(i+1)*4;j++){
                    footballTeams.get(i).add(footballTeam.get(randomArray[j]));
               }
        }
        System.out.println(footballTeams);
    }
}