0926-----homework（1）-优快云博客

本文介绍了一个简单的Java程序，用于查询指定年份的世界杯足球赛冠军队伍及特定国家队夺冠的年份。程序使用了HashMap来存储历届世界杯的年份与冠军国的数据。

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 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 /**
13   *
14   */
15 public class HomeWork0926{
16     public static void main(String[] args)throws Exception{
17         
18         /**
19           *question one
20           */
21 
22         /*create data sourse*/
23 
24         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");
25         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");
26         Map<String,String> footballMap=new HashMap<>();
27         for(int i=0;i<keyList.size();i++){
28             footballMap.put(keyList.get(i),valueList.get(i));
29         }
30 
31         /*query with years*/
32          
33         System.out.print("请输入年份：");    
34         Scanner scanner=new Scanner(System.in);
35         String strKey=scanner.nextLine();
36         if(!footballMap.containsKey(strKey))
37             System.out.println("没有举办世界杯");
38         else
39             System.out.println("世界杯冠军是： "+footballMap.get(strKey));
40 
41         /*query with countrys */
42         
43         System.out.print("请输入国家名称：");
44         String strValue=scanner.nextLine();
45         if(!footballMap.containsValue(strValue))
46             System.out.println(strValue+"没有得过世界杯的冠军");
47         else{
48             System.out.println(strValue+"得冠军年份是：");
49             footballMap.keySet().stream().filter(i->strValue.equals(footballMap.get(i))).sorted().forEach(System.out::println);    //filter the data then sorted then println
50         }
51     }
52 }