In the example below you can see how to convert an array into JSON string. We serialize the array to JSON using the Gson.toJson() method. To deserialize a string of JSON into array we use the Gson.fromJson() method.
package org.kodejava.example.google.gson;
import com.google.gson.Gson;
public class ArrayToJson {
public static void main(String[] args) {
int[] numbers = {1, 1, 2, 3, 5, 8, 13};
String[] days = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
//
// Create a new instance of Gson
//
Gson gson = new Gson();
//
// Convert numbers array into JSON string.
//
String numbersJson = gson.toJson(numbers);
//
// Convert strings array into JSON string
//
String daysJson = gson.toJson(days);
System.out.println("numbersJson = " + numbersJson);
System.out.println("daysJson = " + daysJson);
//
// Convert from JSON string to a primitive array of int.
//
int[] fibonacci = gson.fromJson(numbersJson, int[].class);
for (int i = 0; i < fibonacci.length; i++) {
System.out.print(fibonacci[i] + " ");
}
System.out.println("");
//
// Convert from JSON string to a string array.
//
String[] weekDays = gson.fromJson(daysJson, String[].class);
for (int i = 0; i < weekDays.length; i++) {
System.out.print(weekDays[i] + " ");
}
System.out.println("");
//
// Converting multidimensional array into JSON
//
int[][] data = {{1, 2, 3}, {3, 4, 5}, {4, 5, 6}};
String json = gson.toJson(data);
System.out.println("Data = " + json);
//
// Convert JSON string into multidimensional array of int.
//
int[][] dataMap = gson.fromJson(json, int[][].class);
for (int i = 0; i < data.length; i++) {
for (int j = 0; j < data[i].length; j++) {
System.out.print(data[i][j] + " ");
}
System.out.println("");
}
}
}