Java arraylist to json string

There are several ways to convert an ArrayList to a JSON string in Java. Here are two of the most common methods:

Using Gson

Gson is a popular Java library for converting Java objects to and from JSON. To convert an ArrayList to a JSON string using Gson, you can use the following code:

Code snippet
import com.google.gson.Gson;

public class Main {

public static void main(String[] args) {
// Create an ArrayList of strings.
ArrayList<String> list = new ArrayList<>();
list.add("Hello");
list.add("World");

// Create a Gson object.
Gson gson = new Gson();

// Convert the ArrayList to a JSON string.
String json = gson.toJson(list);

// Print the JSON string.
System.out.println(json);
}
}

The output of the above code will be the following JSON string:

Code snippet
[
"Hello",
"World"
]

Using Jackson

Jackson is another popular Java library for converting Java objects to and from JSON. To convert an ArrayList to a JSON string using Jackson, you can use the following code:

Code snippet
import com.fasterxml.jackson.databind.ObjectMapper;

public class Main {

public static void main(String[] args) {
// Create an ArrayList of strings.
ArrayList<String> list = new ArrayList<>();
list.add("Hello");
list.add("World");

// Create an ObjectMapper object.
ObjectMapper mapper = new ObjectMapper();

// Convert the ArrayList to a JSON string.
try {
String json = mapper.writeValueAsString(list);
} catch (JsonProcessingException e) {
e.printStackTrace();
}

// Print the JSON string.
System.out.println(json);
}
}

The output of the above code will be the same as the output of the previous code.