如何在java中制作嵌套的HashMap

Question

我正在尝试将匿名哈希映射放入另一个哈希映射中：-

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

请使用这种方式来定义您的嵌套哈希图。

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={username=rohan}}