Java SequenceWriter-class And Method Code Example

The SequenceWriter class from the com.fasterxml.jackson.databind package is used to write a sequence of JSON values, such as an array or a list of objects. This class provides methods for writing JSON values, such as strings, numbers, and objects, to a JSON output stream.

Here is an example of how to use the SequenceWriter class to write a list of Java objects to a JSON array:

import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SequenceWriter;
import java.util.ArrayList;
import java.util.List;

public class MyClass {
    public static void main(String[] args) throws Exception {
        JsonFactory factory = new JsonFactory();
        StringWriter writer = new StringWriter();
        ObjectMapper mapper = new ObjectMapper();
        SequenceWriter seqWriter = mapper.writer().writeValues(factory.createGenerator(writer));

        List<MyObject> myObjects = new ArrayList<>();
        MyObject obj1 = new MyObject("John", 30);
        MyObject obj2 = new MyObject("Jane", 25);

        for (MyObject obj : myObjects) {

class MyObject {
    private String name;
    private int age;

    public MyObject(String name, int age) { = name;
        this.age = age;

    public String getName() {
        return name;

    public int getAge() {
        return age;

In this example, a JsonFactory is used to create a SequenceWriter instance that writes to a StringWriter. The SequenceWriter writes out a list of MyObject instances as a JSON array. The code loops through the list of MyObject instances, writing each one to the SequenceWriter.

When this code is run, it will output the following JSON string:


This example shows how to write a sequence of JSON values, in this case, a list of MyObject instances, to a JSON output stream. The SequenceWriter class provides a convenient way to write a sequence of JSON values, such as an array or a list of objects, to a JSON output stream.