Read json with the GSON library

Using HasMap with String can work with data which has the layout of the key and value , basic example :

Code:

import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import java.io.FileReader;
import java.io.IOException;
import java.io.Reader;
import java.lang.reflect.Type;
import java.util.HashMap;
import java.util.List;
import java.util.Set;

Gson gson = new Gson();

try (Reader reader = new FileReader("c:\Temp\arquivo.json"))
{
    Type listType =
           new TypeToken<HashMap<String, HashMap<String, List<String>>>>(){}.getType();
    HashMap<String, HashMap<String, List<String>>> c = gson.fromJson(reader, listType);
    HashMap<String, List<String>> get = c.get("profissao");
    Set<String> items =  get.keySet();
    for(String item: items){
        System.out.println(item);
        System.out.println(get.get(item));
        System.out.println("-----------------------");
    }    
} 
catch (IOException e) 
{    
}

Output:

run:
jornalista
[escritor, legal, fotografo]
-----------------------
maquinista
[senai, mecanico, articulado]
-----------------------
programador
[focado, exatas, articulado]
-----------------------
CONSTRUÍDO COM SUCESSO (tempo total: 0 segundos)

• Class HashMap
• Interface List
• GSON to deserialise array of name / value pairs SOEn
• Post Processing on Gson Deserialization
• Gson Map Key Pair to json
• Class KeyPair
• google-gson