The Flexjson is a lightweight library for serializing and deserializing Java objects into and from JSON format allowing both deep and shallow copies of objects. In order to run a Java program with flexjon, we need to import a flexjson package. We can deserialize a JSON to Java object using the deserialize() method of JSONDeserializer class, it takes as input a json string and produces a static typed object graph from that json representation. By default, it uses the class property in the json data in order to map the untyped generic json data into a specific Java type.
Syntax
public T deserialize(String input)
In the below program, deserialize a JSON to Java object
Example
import flexjson.*; public class DeserializeJSONTest { public static void main(String[] args) { JSONDeserializer<Student> deserializer = new JSONDeserializer<Student>(); String jsonStr = "{" + "\"firstName\": \"Ravi\"," + "\"lastName\": \"Chandra\"," + "\"age\": 35," + "\"class\": \"Student\"," + "\"salary\": 50000.00," + "}"; Student student = deserializer.deserialize(jsonStr); System.out.println(student); } } // Student class class Student { private String firstName; private String lastName; private int age; private double salary; public Student() {} public Student(String firstName, String lastName, int age, double salary) { super(); this.firstName = firstName; this.lastName = lastName; this.age = age; this.salary = salary; } public String getFirstName() { return firstName; } public void setFirstName(String firstName) { this.firstName = firstName; } public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public double getSalary() { return salary; } public void setSalary(double salary) { this.salary = salary; } public String toString() { return "Student[ " + "firstName = " + firstName + ", lastName = " + lastName + ", age = " + age + ", salary = " + salary + " ]"; } }
Output
Student[ firstName = Ravi, lastName = Chandra, age = 35, salary = 50000.0 ]