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/* package whatever; // don't place package name! */
 
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;
 
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.Iterator;
 
public class JsonSimpleReadExample {
 
    public static void main(String[] args) {
 
        JSONParser parser = new JSONParser();
 
        try {
 
            Object obj = parser.parse(new FileReader("f:\\test.json"));
 
            JSONObject jsonObject = (JSONObject) obj;
            System.out.println(jsonObject);
 
            String name = (String) jsonObject.get("name");
            System.out.println(name);
 
            long age = (Long) jsonObject.get("age");
            System.out.println(age);
 
            // loop array
            JSONArray msg = (JSONArray) jsonObject.get("messages");
            Iterator<String> iterator = msg.iterator();
            while (iterator.hasNext()) {
                System.out.println(iterator.next());
            }
 
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ParseException e) {
            e.printStackTrace();
        }
 
    }
 
}

Main.java:13: error: class JsonSimpleReadExample is public, should be declared in a file named JsonSimpleReadExample.java
public class JsonSimpleReadExample {
       ^
Main.java:3: error: package org.json.simple does not exist
import org.json.simple.JSONArray;
                      ^
Main.java:4: error: package org.json.simple does not exist
import org.json.simple.JSONObject;
                      ^
Main.java:5: error: package org.json.simple.parser does not exist
import org.json.simple.parser.JSONParser;
                             ^
Main.java:6: error: package org.json.simple.parser does not exist
import org.json.simple.parser.ParseException;
                             ^
Main.java:17: error: cannot find symbol
        JSONParser parser = new JSONParser();
        ^
  symbol:   class JSONParser
  location: class JsonSimpleReadExample
Main.java:17: error: cannot find symbol
        JSONParser parser = new JSONParser();
                                ^
  symbol:   class JSONParser
  location: class JsonSimpleReadExample
Main.java:23: error: cannot find symbol
            JSONObject jsonObject = (JSONObject) obj;
            ^
  symbol:   class JSONObject
  location: class JsonSimpleReadExample
Main.java:23: error: cannot find symbol
            JSONObject jsonObject = (JSONObject) obj;
                                     ^
  symbol:   class JSONObject
  location: class JsonSimpleReadExample
Main.java:33: error: cannot find symbol
            JSONArray msg = (JSONArray) jsonObject.get("messages");
            ^
  symbol:   class JSONArray
  location: class JsonSimpleReadExample
Main.java:33: error: cannot find symbol
            JSONArray msg = (JSONArray) jsonObject.get("messages");
                             ^
  symbol:   class JSONArray
  location: class JsonSimpleReadExample
Main.java:43: error: cannot find symbol
        } catch (ParseException e) {
                 ^
  symbol:   class ParseException
  location: class JsonSimpleReadExample
12 errors

Standard output is empty