java - 如何在java中制作嵌套的HashMap

Question

我正在尝试将一个匿名 HashMap 放入另一个 HashMap 中:-

Map<String, Object> requestBody=new HashMap<String, Object>();
requestBody.put("UPSSecurity", new HashMap<String, Object>().put("username","rohan"));
System.out.println(requestBody);

输出是:-

{UPSSecurity=null}

Answer 1

请使用这种方式定义您的嵌套 HashMap 。

Map<String, Object> requestBody=new HashMap<String, Object>();
Map<String,Object> userdetails=new HashMap<String, Object>();
userdetails.put("username","rohan");
requestBody.put("UPSSecurity",userdetails );
System.out.println(requestBody);

输出:

{UPSSecurity={用户名=rohan}}