How to convert List to Json in Java

import org.json.JSONArray;

import org.json.JSONException;

import org.json.JSONObject; 

public JSONArray convertListToJson(List<JavaBean> resultList) throws Exception {

JSONObject jsonObject = null;

JSONArray jsnArray = new JSONArray();

for (JavaBean javaBean : resultList) {

jsonObject = new JSONObject();

jsonObject.put("key1", JavaBean.getKey1());

jsonObject.put("key2", JavaBean.getKey2());

jsonObject.put("key3", JavaBean.getKey3());

jsonObject.put("key4", JavaBean.getKey4());

jsonObject.put("key5", JavaBean.getKey5());

jsonObject.put("key6", JavaBean.getKey6());

jsnArray.put(jsonObject);

}

return jsnArray;

}

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Java

(1) What is factory method and give some Examples ?

The Jave method that is capable of constructing it's own java class object is called factory method.Most of all factory methods are static methods

Ex 1 :  Thread t = Thread.currentThread() ;

The java.lang.Thread.currentThread() method returns a reference to the currently executing thread object.

 Ex 2 : String st = String.valueOf(20):

 String.valueOf(20) Returns the string representation of the int argument 

 Ex 3 : Class c = Class.forName(String className);

 java.lang.Class.forName(String className)  method returns the Class object for the class with the specified name.

Ex 4 : Calendar cal = Calendar.getInstance() ;

Calendar.getInstance() returns a Calendar 

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