Map遍历的四种方法

写本博客仅为了加强记忆，不喜勿喷

方法一

​
for (String v : map.values()) {  
    System.out.println("value= " + v);  
} 

方法二

​
for (String key : map.keySet()) {  
    System.out.println("key= "+ key + " and value= " + map.get(key));  
}

​

 方法三

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

方法四

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