How can we convert a JSON string to a JSON object in Java?

The JSON stands for JavaScript Object Notation and it can be used to transfer and storage of data.  
The JSONObject can parse text from a String to produce a map-like object. The object provides methods for manipulating its contents, and for producing a JSON compliant object serialization. The JSONArray can parse text from a String to produce a vector-like object. The object provides methods for manipulating its contents, and for producing a JSON compliant array serialization.

In the below two examples, We can convert a JSON string to a JSON object.

Example 1

import org.json.JSONObject;
import org.json.JSONArray;
public class StringToJSONTest {
   public static void main(String args[]) {
      String str = "[{\"No\":\"1\",\"Name\":\"Adithya\"},{\"No\":\"2\",\"Name\":\"Jai\"}, {\"No\":\"3\",\"Name\":\"Raja\"}]";
      JSONArray array = new JSONArray(str);
      for(int i=0; i < array.length(); i++) {
         JSONObject object = array.getJSONObject(i);
         System.out.println(object.getString("No"));
         System.out.println(object.getString("Name"));
      }
   }
}

Output

1
Adithya
2
Jai
3
Raja

Example 2

import org.json.*;
public class StringToJsonObjectTest {
   public static void main(String[] args) {
      String str = "{\"name\": \"Raja\", \"technology\": \"Java\"}";
      JSONObject json = new JSONObject(str);
      System.out.println(json.toString());
      String tech = json.getString("technology");
      System.out.println(tech);
   }
}

Output

{"name":"Raja","technology":"Java"}
Java