You are asking Jackson to parse a StudentList. Tell it to parse a List (of students) instead. Since List is generic you will typically use a TypeReference
List<Student> participantJsonList = mapper.readValue(jsonString, new TypeReference<List<Student>>(){});
Baeldung
baeldung.com › home › java › java list › converting a java list to a json array
Converting a Java List to a Json Array | Baeldung
June 18, 2025 - In addition to external libraries like Gson and Jackson, Java also provides a built-in library called org.json for JSON processing. To convert a Java List to a JSON array using org.json, we can use the JSONArray class to accomplish this task.
Mkyong
mkyong.com › home › java › how to parse json array with jackson
How to parse JSON Array with Jackson - Mkyong.com
April 23, 2024 - convert JSON array to Array objects ... System.out.println(p); } // 2. convert JSON array to List List<Person> person2 = mapper.readValue(jsonArray, new TypeReference<>() { }); person2.forEach(System.out::println); } } ... ...
android - Convert Json Array to normal Java list - Stack Overflow
Is there a way to convert JSON Array to normal Java Array for android ListView data binding? More on stackoverflow.com
How to turn json objects into an array of json objects using Java?
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June 28, 2022how to put json string into list in java - Stack Overflow
Find the answer to your question by asking. Ask question ... See similar questions with these tags. ... Domain expertise still wanted: the latest trends in AI-assisted knowledge for... ... I’m Jody, the Chief Product and Technology Officer at Stack Overflow. Let’s... 0 Java - How can i read json ... More on stackoverflow.com
How to parse json to get size of the list using jsonObject in java?
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February 6, 2022Videos
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Top answer 1 of 11
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You are asking Jackson to parse a StudentList. Tell it to parse a List (of students) instead. Since List is generic you will typically use a TypeReference
List<Student> participantJsonList = mapper.readValue(jsonString, new TypeReference<List<Student>>(){});
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For any one who looks for answer yet:
1.Add jackson-databind library to your build tools like Gradle or Maven
2.in your Code:
ObjectMapper mapper = new ObjectMapper();
List<Student> studentList = new ArrayList<>();
studentList = Arrays.asList(mapper.readValue(jsonStringArray, Student[].class));
Baeldung
baeldung.com › home › json › jackson › convert json array to java list
Convert JSON Array to Java List | Baeldung
August 13, 2025 - Then, we use the readValue() method of the ObjectMapper object to convert the JSON array String to a List. Similar to the assertion discussed previously, finally, we compare a specific field from the String JSON array to the jacksonList ...
MuleSoft
help.mulesoft.com › s › question › 0D52T00004mXPbwSAG › convert-json-array-to-java-list-of-objects
Convert json array to java list of objects
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How to do in Java
howtodoinjava.com › home › convert json array to list: gson, jackson and org.json
Convert JSON Array to List: Gson, Jackson and Org.json
September 25, 2023 - In Java, due to type erasure, the generic type information of collections (like List<T>) is not available at runtime. So Gson doesn’t know the exact type we want to deserialize to when dealing with generic types. The TypeToken class retains this information and acts as a workaround for the limitations of type erasure. List<Person> readPersonListFromJsonArray(String jsonArray) { //Use autowired bean in Spring / Spring Boot Gson gson = new Gson(); Type listType = new TypeToken<List<Person>>() {}.getType(); List<Person> personList = gson.fromJson(jsonArray, listType); return personList; }
Java Code Geeks
javacodegeeks.com › home › core java
Converting JSON Array to Java List with Gson - Java Code Geeks
April 25, 2024 - Then, we use Gson’s fromJson() method, passing the JSON string and the Type object, to deserialize the JSON array into a Java List.
Attacomsian
attacomsian.com › blog › jackson-convert-json-array-to-from-java-list
Convert JSON array to a list using Jackson in Java
November 6, 2022 - Now we can use the readValue() method from the ObjectMapper class to transform the above JSON array to a list of User objects, as shown below: try { // JSON array String json = "[{\"name\":\"John Doe\",\"email\":\"john.doe@example.com\"," + ...
TutorialsPoint
tutorialspoint.com › how-can-we-convert-a-json-array-to-a-list-using-jackson-in-java
How can we convert a JSON array to a list using Jackson in Java?\\n
June 5, 2025 - Use the ObjectMapper class to read the JSON array and convert it to a list of objects.
HowToDoInJava
howtodoinjava.com › home › gson › gson – parse json array to java array or list
Gson - Parse JSON Array to Java Array or List
April 4, 2023 - Gson parses JSON arrays as members without difficulty if they are non-root objects. We can use the fromJson() method in the usual manner and it will parse the JSON array correctly to the required java array or list.
Stack Abuse
stackabuse.com › converting-json-array-to-a-java-array-or-list
Convert JSON Array to a Java Array or List with Jackson
September 8, 2020 - In this article, we've used Jackson to parse and map the values from a JSON String and file into a Java array and list.
Coderanch
coderanch.com › t › 697439 › java › convert-JSON-Array-arraylist
how to convert JSON Array to arraylist (Java in General forum at Coderanch)
August 2, 2018 - Here's the JSON Array that i've received : [{"FOODID":"Jus Alpukat","PRICE":"7000","NUM":"1","RES":"7000.0","ORDERID_FK":""},{"FOODID":"Ice Cream","PRICE":"5000","NUM":"10","RES":"50000.0","ORDERID_FK":""}] i need it to be converted into arraylist that will be inserted into JTable into java.
Top answer 1 of 16
196
ArrayList<String> list = new ArrayList<String>();
JSONArray jsonArray = (JSONArray)jsonObject;
if (jsonArray != null) {
int len = jsonArray.length();
for (int i=0;i<len;i++){
list.add(jsonArray.get(i).toString());
}
}
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If you don't already have a JSONArray object, call
JSONArray jsonArray = new JSONArray(jsonArrayString);
Then simply loop through that, building your own array. This code assumes it's an array of strings, it shouldn't be hard to modify to suit your particular array structure.
List<String> list = new ArrayList<String>();
for (int i=0; i<jsonArray.length(); i++) {
list.add( jsonArray.getString(i) );
}
BeginnersBook -
beginnersbook.com › home › java › convert json array to arraylist in java
Convert JSON Array to ArrayList in Java
June 13, 2024 - 2. Parse the JSON Array and Convert to ArrayList: Let’s write the code to convert the JSON array to ArrayList. import org.json.JSONArray; import org.json.JSONObject; import java.util.ArrayList; public class JsonToArrayList { public static void main(String[] args) { // This is our JSON array contains name and age String jsonArrayString = "[{\"name\":\"Chaitanya\", \"age\":37}, {\"name\":\"Rahul\", \"age\":34}]"; // Convert JSON array to JSONArray JSONArray jsonArray = new JSONArray(jsonArrayString); // Convert JSONArray to ArrayList ArrayList<JSONObject> arrayList = new ArrayList<>(); for (int i = 0; i < jsonArray.length(); i++) { arrayList.add(jsonArray.getJSONObject(i)); } // Print the ArrayList for (JSONObject obj : arrayList) { System.out.println(obj.toString()); } } }
javathinking
javathinking.com › blog › convert-jsonnode-to-list-java
Convert JsonNode to List in Java — javathinking.com
The process of converting a JsonNode to a List involves iterating over the elements of the JsonNode (if it is an array) and extracting the values to populate the List. Data Parsing: When receiving JSON data from an API, you may need to convert ...
Google Groups
groups.google.com › g › vertx › c › 5fgz-e2rTbk
casting a JsonArray to a specific type
Also, if you're using Java 8 you can make the List to List<String> conversion a little prettier with the stream API. Something like... List<String> list = array.toList().stream().collect(Collectors.mapping(value -> value.toString()), Collectors::toList); Might have that a little wrong since I typed that from my phone :-) On Dec 28, 2014, at 3:23 PM, Alexander Lehmann <alex...@gmail.com> wrote: I wonder if there is a smarter way to cast a JsonArray to a List of specific type.
Reddit
reddit.com › r/javahelp › how to turn json objects into an array of json objects using java?
r/javahelp on Reddit: How to turn json objects into an array of json objects using Java?
June 28, 2022 -
Hi. I'm new to java and stuck wondering how I would go about turning something like this: {} {} {} into this: [{},{},{}]. I'm trying to figure out how to do this to my incoming json data using Java. The data has like 20 similar objects, with the same keys but with constantly changing values.
Any help is much appreciated.
Sincerely,
your friendly neighborhood noob
Top answer 1 of 2
4
Look into Collections. you can use a List with List.of(obj1, obj2,...), The return here is going to be immutable and serializable, alternatively Arrays.asList({obj1, obj2,...}). Again, check out java.util.collections for more details
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Please ensure that: Your code is properly formatted as code block - see the sidebar (About on mobile) for instructions You include any and all error messages in full You ask clear questions You demonstrate effort in solving your question/problem - plain posting your assignments is forbidden (and such posts will be removed) as is asking for or giving solutions. Trying to solve problems on your own is a very important skill. Also, see Learn to help yourself in the sidebar If any of the above points is not met, your post can and will be removed without further warning. Code is to be formatted as code block (old reddit: empty line before the code, each code line indented by 4 spaces, new reddit: https://imgur.com/a/fgoFFis ) or linked via an external code hoster, like pastebin.com, github gist, github, bitbucket, gitlab, etc. Please, do not use triple backticks (```) as they will only render properly on new reddit, not on old reddit. Code blocks look like this: public class HelloWorld { public static void main(String[] args) { System.out.println("Hello World!"); } } You do not need to repost unless your post has been removed by a moderator. Just use the edit function of reddit to make sure your post complies with the above. If your post has remained in violation of these rules for a prolonged period of time (at least an hour), a moderator may remove it at their discretion. In this case, they will comment with an explanation on why it has been removed, and you will be required to resubmit the entire post following the proper procedures. To potential helpers Please, do not help if any of the above points are not met, rather report the post. We are trying to improve the quality of posts here. In helping people who can't be bothered to comply with the above points, you are doing the community a disservice. I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.
Medium
medium.com › @salvipriya97 › how-to-convert-json-array-to-java-pojo-using-jackson-367ac93f7b15
How to convert JSON array to Java POJO using Jackson | by Priya Salvi | Medium
June 18, 2024 - Main Class to Convert JSON to List of Person Objects: import com.fasterxml.jackson.core.type.TypeReference; import com.fasterxml.jackson.databind.ObjectMapper; import java.util.List; public class Main { public static void main(String[] args) { String jsonArray = "[{\"name\":\"John\", \"age\":30, \"address\":[{\"apartment\":\"A1\",\"street\":\"Main St\",\"pinCode\":\"12345\"}], \"unknownField\":\"value\"}, {\"name\":\"Alice\", \"age\":25, \"address\":[{\"apartment\":\"B2\",\"street\":\"Second St\",\"pinCode\":\"67890\"}]}]"; try { ObjectMapper objectMapper = new ObjectMapper(); List<Person> per
Top answer 1 of 4
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Online : Working code
First create a class to store your values :
class Data{
String id;
String operator;
String value;
}
Then iterate over the json :
JSONArray jsonArr = new JSONArray("[JSON Stirng]");
List<Data> dataList = new ArrayList<>();
for (int i = 0; i < jsonArr.length(); i++) {
JSONObject jsonObj = jsonArr.getJSONObject(i);
Data data = new Data();
data.id = jsonObj.getString("id");
data.operator = jsonObj.getString("operator");
data.value = jsonObj.getString("value");
dataList.add(data);
}
Now dataList has your data!
P.S. : Use getter/setters in Data class
JAR : http://www.java2s.com/Code/Jar/j/Downloadjavajsonjar.htm
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- Use any JSON parsor eg: GSON to create an arraylist of this particular json
- Iterate the arraylist
- Save it :)
DevGenius
blog.devgenius.io › how-to-convert-a-java-list-to-a-json-array-a-simple-guide-d3428951a488
How to Convert a Java List to a JSON Array: A Simple Guide | by M Business Solutions | Dev Genius
December 5, 2024 - Fortunately, converting a Java List to a JSON array is straightforward with the help of libraries like Jackson or Gson.