1.map.keySet()方法

Set set = map.keySet();
for(Iterator iter = set.iterator(); iter.hasNext();)
  {
   String key = (String)iter.next();
   String value = (String)map.get(key);
   System.out.println(key+"===="+value);
  }

Set<String> s = map.keySet();
for(String key : s){
   String value= map.get(key);
   System.out.println(key+"---"+value);
 }
 

2.使用使用Map.Entry

Set set = map.entrySet();
  
  for(Iterator iter = set.iterator(); iter.hasNext();)
  {
   Map.Entry entry = (Map.Entry)iter.next();
   
   String key = (String)entry.getKey();
   String value = (String)entry.getValue();
   System.out.println(key +" :" + value);
  }

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