Programming Articles - Page 2440 of 3363

In this article, we will learn how to construct a JSON object from a subset of another JSON object in Java. If you are not familiar with JSON and its usage in Java, you can refer to our JSON Overview tutorial. JSON Object From a Subset of Another Object There is more than one way to construct a JSON object from a subset of another JSON object in Java. Some of the popular libraries that we can use are - Using org.json library Using Gson library Using ... Read More

In this article, we will be learning how to merge two JSON arrays in Java. Let's understand step by step. First, if you are not familiar with JSON, refer JSON overview. How to Merge Two JSON Arrays in Java? There are multiple ways to merge two JSON arrays in Java. Some of them are: Using org.json library: We will use JSONArray.put() method to merge two JSON arrays. Using Gson library: We will use JsonArray.add() method to merge two JSON arrays. Using Jackson library: We will use ObjectMapper.createArrayNode() ... Read More

The JSON is a lightweight, text-based and language-independent data exchange format. The JSON can represent two structured types like objects and arrays. An object is an unordered collection of key/value pairs and an array is an ordered sequence of values. We can convert a Map to JSON object using the toJSONString() method(static) of org.json.simple.JSONValue. It has two important static methods: writeJSONString() method to encode an object into JSON text and write it out, escape() method to escape the special characters and escape quotes,  \, /, \r, , \b, \f, \t.Exampleimport java.util.*; import org.json.simple.JSONValue; public class ConvertMapJSONTest {    public static void main(String[] args) {       ... Read More

The Set class in JavaScript provides a clear method to remove all elements from a given set object. This method can be used as follows −Examplelet mySet = new Set(); mySet.add(1); mySet.add(2); mySet.add(1); mySet.add(3); mySet.add("a"); console.log(mySet) mySet.clear(); console.log(mySet)OutputSet { 1, 2, 3, 'a' } Set { }You can also individually remove the elements by iterating over them.Examplelet mySet = new Set(); mySet.add(1); mySet.add(2); mySet.add(1); mySet.add(3); mySet.add("a"); console.log(mySet) for(let i of mySet) {    console.log(i)    mySet.delete(i) } console.log(mySet)OutputSet { 1, 2, 3, 'a' } Set { }

C# provides two methods to link value type to reference type and vice e Versa. These two methods for linking are named boxing and unboxing where Boxing is used for the conversion of the value type to an object type while Unboxing refers to the conversion of the object type to the value type.The following are the important differences between Boxing and Unboxing.Sr. No.KeyBoxingUnboxing1ImplementationBoxing made object type referred to as the value type.Unboxing basically processes the retrieving value from the boxed object.2StorageIn the case of boxing, the value stored on the stack is copied to the object stored on heap ... Read More

In order to store multiple values or objects of the same type, Java provides two types of data structures namely Array and Collection.The following are the important differences between Arrays and Collection.Sr. No.KeyArraysCollection1SizeArrays are fixed in size i.e once the array with the specific size is declared then we can't alter its size afterward.The collection is dynamic in size i.e based on requirement size could be get altered even after its declaration.2Memory ConsumptionArrays due to fast execution consumes more memory and has better performance.Collections, on the other hand, consume less memory but also have low performance as compared to Arrays.3Data ... Read More

A JSON is a lightweight data-interchange format and the format of JSON is a key with value pair. The JSONObject can parse a text from a String to produce a map-like object and supports java.util.Map interface. We can use org.json.simple.JSONObject to merge two JSON objects in Java.We can merge two JSON objects using the putAll() method (inherited from interface java.util.Map) in the below program.Exampleimport java.util.Date; import org.json.simple.JSONObject; public class MergeJsonObjectsTest {    public static void main(String[] args) {       JSONObject jsonObj = new JSONObject(); // first json object       jsonObj.put("Name", "Adithya");       jsonObj.put("Age", 25);     ... Read More

The JSON is one of the widely used data-interchange formats and is a lightweight and language independent. The json.simple is a lightweight JSON processing library that can be used to write JSON files and it can be used to encode or decode JSON text and fully compliant with JSON specification(RFC4627). In order to read a JSON file, we need to download the json-simple.jar file and set the path to execute it.Exampleimport java.io.*; import java.util.*; import org.json.simple.*; import org.json.simple.parser.*; public class JSONObjectWriterToFileTest {    public static void main(String[] args) throws IOException {       JSONObject obj = new JSONObject();       obj.put("Name", "Adithya");       ... Read More

The JSON is a text-based format for exchanging data. It is a lightweight component and language independent. We can also add a JSONArray to JSONObject. We need to add a few items to an ArrayList first and pass this list to the put() method of JSONArray class and finally add this array to JSONObject using the put() method. Exampleimport org.json.*; import java.util.*; public class AddJSONArrayToJSONObjTest {    public static void main(String args[]) {       List list = new ArrayList();       list.add("Raja");       list.add("Jai");       list.add("Adithya");       JSONArray array = new JSONArray();       for(int i = 0; i < list.size(); ... Read More

The JSON is one of the widely used data-interchange formats and is a lightweight and language independent. The json.simple is a lightweight JSON processing library that can be used to read and write JSON files and it can be used to encode or decode JSON text and fully compliant with JSON specification (RFC4627). In order to read a JSON file, we need to download the json-simple.jar file and set the path to execute it.json fileExampleimport java.io.*; import java.util.*; import org.json.simple.*; import org.json.simple.parser.*; public class JSONReadFromTheFileTest {    public static void main(String[] args) {       JSONParser parser = new JSONParser();       try {     ... Read More