JsonGenerator jg = new JsonFactory().createJsonGenerator(System.out);
    jg.configure(JsonGenerator.Feature.WRITE_NUMBERS_AS_STRINGS, true);
    jg.writeStartArray();
    int i = 0;
    while (i < 6)
    {
        jg.writeStartArray();
        jg.writeObject(i++);
        jg.writeObject(i++);
        jg.writeEndArray();
    }

    jg.writeEndArray();
    jg.flush();

OUTPUT:

 [["0","1"],["2","3"],["4","5"]]

Do you need a json like this...?

You can write an object to a json string. So I hope you have your data in an object of a class defined as per your need. Here is how you can convert that object into a json string:

//1. Convert Java object to JSON format
ObjectMapper mapper = new ObjectMapper();

String jsonString = mapper.writeValueAsString(yourObject);

See here for the full jackson-databind javadoc.

The other answer is correct, but for completeness, here are other ways:

List<SomeClass> list = mapper.readValue(jsonString, new TypeReference<List<SomeClass>>() { });
SomeClass[] array = mapper.readValue(jsonString, SomeClass[].class);

Write a list of objects to Json file:

ObjectMapper objectMapper = new ObjectMapper();
objectMapper.enable(SerializationFeature.INDENT_OUTPUT);
objectMapper.writeValue(new File("d:/temp/output.json"), studentList);

Where studentList is:

// object
Student student = new Student();
student.setActive(false);
student.setFirstName("Kir");
student.setId(123);
student.setLastName("Ch");

// list of objects
List<Student> studentList = List.of(student, student);

The result:

[ {
  "id" : 123,
  "firstName" : "Kir",
  "lastName" : "Ch",
  "active" : false,
  "address" : null,
  "languages" : null
}, {
  "id" : 123,
  "firstName" : "Kir",
  "lastName" : "Ch",
  "active" : false,
  "address" : null,
  "languages" : null
} ]