import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;

import com.google.common.reflect.TypeToken;
import com.google.gson.Gson;


public class JSONStringToJavaObject {
    public static void main(String args[]) throws Exception {
        String jsonString = "['Raja','Kumar','Vijay','Sam','Guru']";
        List<String> nameList = new ArrayList<String>();

        Type jsonObjectType = new TypeToken<List<String>>() {}.getType();
        nameList = new Gson().fromJson(jsonString, jsonObjectType);

        System.out.println(nameList);
    }
}