gson在反序列化JSON时如何将JSON键与Java类中的字段映射

Question

I am searching for this for quite some time now but still, it is not clear to me. I have a JSON file which looks like this:

{
  "Name" : "Foo Bar",
  "Grade" : "Some Grade",
  "Org" : "Some Org"
}

For deserializing this JSON (using gson) I have created a Java class called StudentDetails.java which looks like this:

public class StudentDetails
{
    public String name;
    public String grade;
    public String org;
}

Now I have a couple of questions regarding this:

1. Will gson automatically maps the fields in StudentDetails.java with corresponding keys even if the fields start with lower case and keys start from upper case in the JSON file. I have looked for @SerializedName but my code works without even using it. On the contrary if I am using something like @SerializedName("Name) with name field, it's getting assigned to null after deserialization. I am so confused right now.
2. Will deserialization work without even getter and setter methods? In jackson you write setter and getter methods.
3. If above is true, does it work even in the case of private fields?

Answer 1

1. I'm note sure about this one but i think the case only matters after the first character because you normally don't start the name of field with an upper-case character. Yes GSON will automatically map the fields.

2. Yes GSON does not need getter/setter ( https://stackoverflow.com/a/6203975/4622620 )

3. Yes GSON can handle private fields because it uses reflections ( https://stackoverflow.com/a/28927525/4622620 )