java json encode meaning

Java JSON Encode using Map

Let's see a simple example to encode JSON object using map in java.

import java.util.HashMap;  
import java.util.Map;  
import org.json.simple.JSONValue;  
public class JsonExample2{    
public static void main(String args[]){    
  Map obj=new HashMap();    
  obj.put("name","sonoo");    
  obj.put("age",new Integer(27));    
  obj.put("salary",new Double(600000));   
  String jsonText = JSONValue.toJSONString(obj);  
  System.out.print(jsonText);  
}}    
Output:

{"name":"sonoo","salary":600000.0,"age":27}
Java JSON Array Encode

Let's see a simple example to encode JSON array in java.

import org.json.simple.JSONArray;  
public class JsonExample1{    
public static void main(String args[]){    
  JSONArray arr = new JSONArray();  
  arr.add("sonoo");    
  arr.add(new Integer(27));    
  arr.add(new Double(600000));   
  System.out.print(arr);  
}}    
Output:

["sonoo",27,600000.0]
Java JSON Array Encode using List

Let's see a simple example to encode JSON array using List in java.

import java.util.ArrayList;  
import java.util.List;  
import org.json.simple.JSONValue;  
public class JsonExample1{    
public static void main(String args[]){    
  List arr = new ArrayList();  
  arr.add("sonoo");    
  arr.add(new Integer(27));    
  arr.add(new Double(600000));   
  String jsonText = JSONValue.toJSONString(arr);  
  System.out.print(jsonText);  
}}    
Output:

["sonoo",27,600000.0]

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what is meaning of encode?

what is difference of above 3 programs and outputs?

output1 from Java JSON Encode using Map is
{"name":"sonoo","salary":600000.0,"age":27}(why brackets are { } unlike [] etc??)

output2 from Java JSON Array Encode is
["sonoo",27,600000.0](why square brackets here??)

output3 from Java JSON Array Encode using List is
sonoo 600000.0 27 (why no brackets here??)