BE THE CODER > JSON > JSON JAVA Examples

JSON (JavaScript Object Notation) is a lightweight text-based open standard designed for human-readable data interchange. Douglas Crockford has provided a reference implementation of JSON in Java at http://json.org/ useful for JSON serialization and deserialization. Click here to download the compiled library. The following example shows getting the keys of a simple JSON object.

File Name :

com/bethecoder/tutorials/json_java/common/Student.java


package com.bethecoder.tutorials.json_java.common;



import java.util.Date;



public class Student {

  private String firstName;

  private String lastName;

  private int age;

  private String hobby;

  private Date dob;



  public Student(String firstName, String lastName, int age, String hobby,

      Date dob) {

    super();

    this.firstName = firstName;

    this.lastName = lastName;

    this.age = age;

    this.hobby = hobby;

    this.dob = dob;

  }

  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 String getHobby() {

    return hobby;

  }



  public void setHobby(String hobby) {

    this.hobby = hobby;

  }

  public Date getDob() {

    return dob;

  }

  public void setDob(Date dob) {

    this.dob = dob;

  }



}

File Name :	com/bethecoder/tutorials/json_java/tests/JsonKeys.java
Author :	Sudhakar KV
Email :	[email protected]


package com.bethecoder.tutorials.json_java.tests;



import java.util.Arrays;

import java.util.Date;



import org.json.JSONException;

import org.json.JSONObject;



import com.bethecoder.tutorials.json_java.common.Student;



public class JsonKeys {



  /**

   * @param args

   * @throws JSONException 

   */

  public static void main(String[] args) throws JSONException {

    Student stud = new Student("Sriram", "Kasireddi", 2, "Singing", new Date(110, 4, 6));

    JSONObject obj = new JSONObject(stud);

    System.out.println(obj.toString(2)); //pretty print with indent

    

    /**

     * Get the names array

     */

    System.out.println(Arrays.toString(JSONObject.getNames(obj)));

  }



}

JSON Keys