Java中Map.Entry

Map<String, String> map = new HashMap<String, String>();  
  map.put("1", "value1");  
  map.put("2", "value2");  
  map.put("3", "value3");  

遍历map方式
1：Map.entrySet迭代器

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