Java中遍历Map的两种方法：keySet和entrySet

//方法一
  Set<String> set = map.keySet(); 
  for (String s:set) {
   System.out.println(s+","+map.get(s));
  }
  //方法二
  Set<Map.Entry<String, String>> entryseSet=map.entrySet();
  for (Map.Entry<String, String> entry:entryseSet) {
   System.out.println(entry.getKey()+","+entry.getValue());
  }