Apr 16, 2013 · I have read a file into an array but am wondering how to parse certain values from that array. My code: ... try{ ... String strLine; String delims= "[ ]+"; //parsing it. ArrayList parsedit = new ArrayList(); while((strLine=br.readLine())!=null){ System.out.println("Being read:"); System.out.println(strLine); parsedit.add(strLine.split(delims));

Nov 13, 2013 · arrays.add(another_json_object); } //Finally JSONObject[] jsons = new JSONObject[arrays.size()]; arrays.toArray(jsons); //The end... You will have to determine if the data is an array (simply checking that charAt(0) starts with [character). Hope this helps.

Feb 2, 2023 · Using the JSONObject class, we parse the jsonObjectString into a JSONObject using the new JSONObject(jsonObjectString) constructor. Then, we use the getString, getInt, and getBoolean methods to extract values from the jsonObject.

Learn to use Google GSON library to deserialize or convert JSON, containing JSON array as root or member, to Java Array or List of objects.

Nov 18, 2013 · You just need to create a new array once and populate the values in it, in the loop. numbers = new double[num.length]; for (int i = 0; i < num.length; ++i) { // numbers = new double[i+1]; // Not needed numbers[i] = Double.valueOf(num[i]); }

Sep 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. This is done via the readValue() method, by specifying the JSON contents (String or file) and by specifying the POJO we'd like to map to.

Mar 7, 2025 · Learn how to convert a JSON array to a Java List using the popular Gson and Jackson libraries.

To read an array from a JSON file using a Java program −. Instantiate the JSONParser class of the json-simple library. Parse the contents of the obtained object using the parse () method. Retrieve the value associated with a key using the get () method.

Apr 26, 2024 · This tutorial will show how to deserialize a JSON Array to a Java Array or Collection with Jackson 2. If you want to dig deeper and learn other cool things you can do with the Jackson 2 – head on over to the main Jackson tutorial .

Feb 20, 2020 · This article shows how to parse JSON Array using Gson. Table of contents: 1. Download Google Gson; 2. Parse JSON Array using Gson; 3. Parse JSON Array of Object Array using Gson; 4. JSON array contains array of object; 5. Unusual JSON array contains array of string; 6. Download Source Code; 7. References; P.S Tested with Gson 2.10.1. 1 ...