list中会直接绑定HashMap中的数据

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

public class HashMapSync {
 static List<HashMap<String, Object>> list = new ArrayList<HashMap<String, Object>>();
 static HashMap<String, Object> map1 = null;
 public static void main(String[] args) {
  map1= new HashMap<String, Object>();
  map1.put("ItemId", 1);
  map1.put("ItemName", "wang");
  list.add(map1);
  HashMap<String, Object> map2 = new HashMap<String, Object>();
  map2 = list.get(0);
  map2.put("ItemName", "li");
  System.out.println("id="+list.get(0).get("ItemId")+"/"+"name="+list.get(0).get("ItemName"));
 }
}

输出结果为：

id=1/name=li