pojo

来源： https://stackoverflow.com/questions/52619663/android-room-efficient-way-to-transform-json-result-into-db-object

来源： https://stackoverflow.com/questions/64004700/read-date-as-an-array-integer-from-json-and-map-with-pojo-as-an-integer

来源： https://stackoverflow.com/questions/63639243/fetch-the-jsonobject-value-to-a-variable-which-is-inside-the-dynamically-generat

问题 I'm trying to serialize a Java instance having fields like follows. public class Person{ private String firstName; private String lastName; public String getFirstName() { return firstName; } public void setFirstName(String firstName) { this.firstName = firstName; } public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } } How do I serialize them in different names than the actual field names? In Gson this is possible by using

问题 I tried using @NotNull annotation but it did not work. If any field is missing in the JsonString , it gives null(String) or zero(int) . But what I want is if any field is missing in the JsonStr defined in the class should throw an exception. Add: My PojoClass may have object reference or multilevel object reference. I am using Gson for the conversion of the String to obj. for more clarification, I have added my code below: JsonStr: { "name":"John", "id":1, "roll":100, "c":{ "city":"Dhaka",

问题 I am storing a custom java object called Device into a mongo collection. This works fine. But when I am receiving the database entry all inner class objects are assigned with null and not with the database value. This is a device: public class Device { public String id; public String serialNumber; public String name; public int status; public String errorReport; public List<Sensor> sensors=new ArrayList<>(); public List<Action> actions=new ArrayList<>(); public List<String> filterTags= new

问题 I have CSV file which is in the form as below student, year, subject, score1, score2, score3 Alex, 2010, Math, 23, 56, 43 Alex, 2011, Science, 45, 32, 45 Matt, 2009, Art, 34, 56, 75 Matt, 2010, Math, 43, 54, 54 I'm trying to find an optimal solution to read the CSV file and load it to a map for lookup purposes i.e. Map<String, Map<String, List<SubjectScore>>> . The first string key is for student, the next string key is for year. class SubjectScore { private String subject; private int score1

问题 I'm using a RecyclerView to display a list of items that are retrieved from a database as Java objects. One of the fields in the object is the ID of the item in the database, so that further operations can be performed with it. My areContentsTheSame implementation compares various fields in the objects to determine if the contents of the item has changed. The problem is that sometimes when the data source is refreshed the ID of the item changes without the visible contents changing (i.e. the

问题 I need to edit the name of "existing field" in POJO instead of adding "extra_field". Is it possible with the approach referenced link below? Please note I do not want to use @JsonProperty annotation. Requirement is, I have a POJO and want to use different field name every time without change in POJO. For example I have a field c_id in POJO and some times it need to write as cust_id and another time it would be my_id . Also note I cannot change implementation of POJO as it is already used in

问题 I'm trying to populate a JTable with POJOS that I've extracted using Gson(). Using the debugger, or by printing the values to the console using toString(), I can see that the mapping of the objects was successful. My problem lies with populating my custom Jtable with the objects. Problem: My GUI contains a button that takes a search field, and sends it to an API which returns a response in JSON, which I map correctly but I do not know how to get the data into the table. What I've tried : The