题解 | #map简单应用#

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner scanner  = new Scanner(System.in);
        String name = scanner.next();
        Map<Integer, String> map = new HashMap<Integer, String>();
        map.put(1, "Amy");
        map.put(2, "Joe");
        map.put(3, "Tom");
        map.put(4, "Susan");

        //write your code here......
        Set<Integer> keyset1 = map.keySet();
        for(int k : keyset1){
            String v = map.get(k);
            System.out.println(k +":"+v);
        }
        
        map.put(5, name);
        map.put(3, "Tommy");
        map.remove(4);
        System.out.println();   // 空行隔开
        Set<Integer> keyset2 = map.keySet();
        for(int k : keyset2){
            String v = map.get(k);
            System.out.println(k +":"+v);
        }
    }
}