Map Traversal 应用实例


package com.map;

import java.util.Collection;

import java.util.HashMap;

import java.util.Map;

import java.util.Map.Entry;

import java.util.Set;

public class MapTraversal {

    public static void main(String[] args) {

        Map<String, String> countries = new HashMap<>();

        contries.put("中国", "北京");

        contries.put("美国", "华盛顿");

        contries.put("韩国", "首尔");

        System.out.println("解放后。。。。。。");

        Set<Entry<String,String>>  countryAndCity = countries.entrySet();

        for(Entry e :contryAndCity){

          

           if(e.getKey().equals("韩国")){

                e.setValue("北京");

          

           }

           System.out.print(e.getKey()+":"+e.getValue()+"    ");

        }

       

    }

}