【转】[Java] HashMap使用的示例

原文网址：http://kings11347.blog.163.com/blog/static/56047032201212895416436/

import java.util.HashMap;

import java.util.Iterator;

import java.util.Set;

import java.util.Map.Entry;

public class HashMapUse {

public static void main(String[] args){

HashMap<String, String> hashMap = new HashMap<String, String>();

hashMap.put("cn","中国");

hashMap.put("us","米国");

hashMap.put("en","英国");

System.out.println(hashMap);

System.out.println("cn"+hashMap.get("cn"));

System.out.println(hashMap.containsKey("cn"));

System.out.println(hashMap.keySet());

System.out.println(hashMap.isEmpty());

//hashMap.remove("cn");

//System.out.println(hashMap.containsKey("cn"));

//使用Iterator遍历HashMap

Iterator it = hashMap.keySet().iterator();

while(it.hasNext()){

String key = (String) it.next();

System.out.println("key:"+key);

System.out.println("value:"+hashMap.get(key));

}

//使用Entry遍历HashMap

Set<Entry<String, String>> sets = hashMap.entrySet();

for(Entry<String,String> entry : sets){

System.out.println(entry.getKey()+", ");

System.out.println(entry.getValue());

}

}

}