星空网 > 软件开发 > Java

java中遍历MAP的几种方法

java中遍历MAP的几种方法 
Java代码 
Map<String,String> map=new HashMap<String,String>();    
map.put("username", "qq");    
map.put("passWord", "123");    
map.put("userID", "1");    
map.put("email", "qq@qq.com");   
Map<String,String> map=new HashMap<String,String>(); 
map.put("username", "qq"); 
map.put("passWord", "123"); 
map.put("userID", "1"); 
map.put("email", "qq@qq.com"); 
第一种用for循环 
Java代码 

for(Map.Entry<String, String> entry:map.entrySet()){    
     System.out.println(entry.getKey()+"--->"+entry.getValue());    
}   
for(Map.Entry<String, String> entry:map.entrySet()){ 
          System.out.println(entry.getKey()+"--->"+entry.getValue()); 


第二种用迭代 
Java代码 

Set set = map.entrySet();         
Iterator i = set.iterator();         
while(i.hasNext()){      
     Map.Entry<String, String> entry1=(Map.Entry<String, String>)i.next();    
     System.out.println(entry1.getKey()+"=="+entry1.getValue());    
}   
Set set = map.entrySet();     
Iterator i = set.iterator();     
while(i.hasNext()){  
    Map.Entry<String, String> entry1=(Map.Entry<String, String>)i.next(); 
    System.out.println(entry1.getKey()+"=="+entry1.getValue()); 

用keySet()迭代 
Java代码 

Iterator it=map.keySet().iterator();    
while(it.hasNext()){    
     String key;    
     String value;    
     key=it.next().toString();    
     value=map.get(key);    
     System.out.println(key+"--"+value);    
}   
Iterator it=map.keySet().iterator(); 
while(it.hasNext()){ 
    String key; 
    String value; 
    key=it.next().toString(); 
    value=map.get(key); 
    System.out.println(key+"--"+value); 


用entrySet()迭代 
Java代码 

Iterator it=map.entrySet().iterator();           
System.out.println( map.entrySet().size());    
String key;           
String value;    
while(it.hasNext()){    
        Map.Entry entry = (Map.Entry)it.next();           
        key=entry.getKey().toString();           
        value=entry.getValue().toString();           
        System.out.println(key+"===="+value);                     
}   




原标题:java中遍历MAP的几种方法

关键词:JAVA

*特别声明:以上内容来自于网络收集,著作权属原作者所有,如有侵权,请联系我们: admin#shaoqun.com (#换成@)。

Prime Day物流群像:“匆匆那年”的集装箱:https://www.goluckyvip.com/news/4745.html
Shopee公告:泰国站点打款周期变更:https://www.goluckyvip.com/news/4746.html
17亿播放!TikTok“钻石画”成为独立站爆款商品!:https://www.goluckyvip.com/news/4747.html
疫情加剧线上需求暴涨,解读东南亚Lazada&Shopee运动户外需求品类:https://www.goluckyvip.com/news/4748.html
shopee虾皮代运营有用吗?shopee代运营不保证销量靠谱吗?:https://www.goluckyvip.com/news/4749.html
2018年中国快递破500亿件大关,超美日欧总和!:https://www.goluckyvip.com/news/475.html
美众议院对TikTok“动手”,下一步该怎么在TikTok上营销?:https://www.kjdsnews.com/a/1836587.html
速卖通在韩国争议不断,投诉量激增两倍:https://www.kjdsnews.com/a/1836588.html
相关文章
我的浏览记录
最新相关资讯
海外公司注册 | 跨境电商服务平台 | 深圳旅行社 | 东南亚物流