java 集合 Map 键—>值

╰半橙微兮° 2022-08-17 14:17 137阅读 0赞

package practice;  
  
  
import java.util.HashMap;  
import java.util.Iterator;  
import java.util.Map;  
import java.util.Map.Entry;  
import java.util.Scanner;  
import java.util.Set;  
  
  
public class ChamberTest   
\{  
public static void main(String\[\] args)   
\{   
Map<Integer, Chamber> p = new HashMap<Integer, Chamber>();  
p.put(1, new Chamber(1930, "乌拉圭"));  
p.put(2, new Chamber(1934, "意大利"));  
p.put(3, new Chamber(1938, "意大利"));  
p.put(4, new Chamber(1950, "乌拉圭"));  
p.put(5, new Chamber(1954, "德国"));  
p.put(6, new Chamber(1958, "巴西"));  
p.put(7, new Chamber(1962, "巴西"));  
p.put(8, new Chamber(1966, "英格兰"));  
p.put(9, new Chamber(1970, "巴西"));  
p.put(10, new Chamber(1974, "德国"));  
p.put(11, new Chamber(1978, "阿根廷"));  
p.put(12, new Chamber(1982, "意大利"));  
p.put(13, new Chamber(1986, "阿根廷"));  
p.put(14, new Chamber(1990, "德国"));  
p.put(15, new Chamber(1994, "巴西"));  
p.put(16, new Chamber(1998, "法国"));  
p.put(17, new Chamber(2002, "巴西"));  
p.put(18, new Chamber(2006, "意大利"));  
  
// System.out.println(p.toString());  
//    
// Set set = p.keySet();  
// for(Object obj: set)  
// \{  
// System.out.println(obj + "--->" + p.get(obj));  
// \}  
  
Set<Map.Entry<Integer, Chamber>> allSet = p.entrySet();  
Iterator<Map.Entry<Integer, Chamber>> iter = allSet.iterator();  
  
winner(iter);  //输入年份，显示冠军；  
  
Iterator<Map.Entry<Integer, Chamber>> iter1 = allSet.iterator();  
year(iter1);   //输入冠军，显示年份；  
\}  
  
public static void winner(Iterator<Entry<Integer, Chamber>> iter)  
\{   
Scanner scan = new Scanner(System.in);  
System.out.println("input year:");  
int i = scan.nextInt();   
int j = 0;  
while(iter.hasNext())  
\{  
Map.Entry<Integer, Chamber> m = iter.next();  
if((m.getValue().year).equals(i))  
\{  
System.out.println(i + "年的世界冠军是：" + m.getValue().winner);  
j++;  
\}   
\}  
if(j==0)  
\{  
System.out.println(i + "年没有世界冠军");  
\}  
\}  
public static void year(Iterator<Entry<Integer, Chamber>> iter1)  
\{  
Scanner scan = new Scanner(System.in);   
String str = scan.next();  
int k=0;   
while(iter1.hasNext())  
\{  
Map.Entry<Integer, Chamber> m1 = iter1.next();  
if(m1.getValue().winner.equals(str))  
\{  
System.out.println(str + " " + "球队获得世界冠军是在：" + " " + m1.getValue().year + " ");  
k++;  
\}   
\}  
if(k==0)  
\{  
System.out.println("没有世界冠军" + str);  
\}   
\}  
\}  
  
  
class Chamber implements Comparable<Chamber>  //实现Comparable接口；  
\{  
Integer year;  
String winner;  
public Chamber(Integer year, String winner)  
\{  
this.year = year;  
this.winner = winner;  
\}  
public Integer getYear()  
\{  
return year;  
\}  
@Override  
public String toString()  //重写toString方法；  
\{  
return "year=" + year + " winner=" + winner;  
\}  
@Override  
public boolean equals(Object obj) //重写equals方法；  
\{  
if(this == obj)  
\{  
return true;  
\}  
else if(obj instanceof Chamber)  
\{  
Chamber c = (Chamber) obj;  
if(this.year == c.year && this.winner == c.winner)  
\{  
return true;  
\}  
\}  
return false;  
\}  
@Override  
public int compareTo(Chamber arg0) //重写compareTo方法；  
\{  
return 0;  
\}  
\}