添加到JsonArray的结果缺少元素

Question

在生成（添加到JsonArray）后，我丢失了一个字段。我正在通过ObjectInputStream接收下面的Json字符串。

[{"firstName":"Vasile","lastName":"Petraru","department":"Management","salary":5600},{"firstName":"Ion","lastName":"Andronic","department":"Finante","salary":3222}]
 Gson gson = new Gson();
 String a =  new String(inputStream.readObject().toString());
 JsonParser parser = new JsonParser();
 JsonArray jArray = parser.parse(a).getAsJsonArray();
 ArrayList<Employee> employees = new ArrayList<>();
 for(JsonElement obj : jArray){
      Employee b = gson.fromJson(obj,Employee.class);
      employees.add(b);
 }

在我像这样添加到JsonArray之后：

public String generateJSON() {
    JSONObject object = new JSONObject();
    JSONArray array = new JSONArray();
    try {
        object.put("Employees", employees);
        array.put(object); // <-- here is the probem...
    } catch (JSONException e) {
        e.printStackTrace();
    }
    return array.toString();
}
a = generateJSON();
System.out.println("nAfter generating: " + a);
// --->
[{"Employees":[{"lastName":"Petraru","salary":5600,"department":"Management"},{"lastName":"Andronic","salary":3222,"department":"Finante"}]}]

生成后，我收到了所需的String，但没有"firstName"元素。。。为什么以及如何解决此问题？感谢

员工类别：

public class Employee implements Serializable {
public String firstName;
public String lastName;
public String department;
public int salary;
public Employee(String firstName, String lastName, String department, int salary){
    this.firstName = firstName;
    this.lastName = lastName;
    this.department = department;
    this.salary = salary;
}

Answer 1

您可以尝试以下方法，而不是直接使用employee类：

JSONObject jo = new JSONObject();
jo.put("firstName", employee.getFirstName);
jo.put("lastName", employee.getLastName);
JSONArray ja = new JSONArray();
ja.put(jo);
JSONObject mainObj = new JSONObject();
mainObj.put("employees", ja);

并在Employee类中声明getter和setter。如果可行，请告诉我。