Código da Imersão Java para o TMDB

App.java

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.net.http.HttpResponse.BodyHandlers;
import java.util.List;
import java.util.Map;

public class App {

    public static void main(String[] args) throws Exception {

        // fazer uma conexão HTTP e buscar os top 250 filmes
        String url = "https://api.themoviedb.org/3/trending/movie/week?api_key=872995efee79646f5b0d834c33522673";
        URI endereco = URI.create(url);
        var client = HttpClient.newHttpClient();
        var request = HttpRequest.newBuilder(endereco).GET().build();
        HttpResponse<String> response = client.send(request, BodyHandlers.ofString());
        String body = response.body();

        // extrair só os dados que interessam (titulo, poster, classificação)
        var parser = new JsonParser();
        List<Map<String, String>> listaDeFilmes = parser.parse(body);

        // exibir e manipular os dados 
        for (Map<String,String> filme : listaDeFilmes) {
            System.out.println(filme.get("title"));
            System.out.println(filme.get("backdrop_path"));
            System.out.println(filme.get("vote_average"));
            System.out.println();
        }
    }
}

JsonParser.java

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class JsonParser {
    
    private static final Pattern REGEX_ITEMS = Pattern.compile("\\[(.+)\\]");
    private static final Pattern REGEX_ATRIBUTOS_JSON = Pattern.compile("\"(.+?)\":\"?(.*?)\"?,");

    public List<Map<String, String>> parse(String json) {
        Matcher matcher = REGEX_ITEMS.matcher(json);
        if (!matcher.find()) {

            throw new IllegalArgumentException("Não encontrou items.");
        }

        String[] items = matcher.group(1).split("\\},\\{");

        List<Map<String, String>> dados = new ArrayList<>();

        for (String item : items) {

            Map<String, String> atributosItem = new HashMap<>();

            Matcher matcherAtributosJson = REGEX_ATRIBUTOS_JSON.matcher(item);
            while (matcherAtributosJson.find()) {
                String atributo = matcherAtributosJson.group(1);
                String valor = matcherAtributosJson.group(2);
                atributosItem.put(atributo, valor);
            }

            dados.add(atributosItem);
        }

        return dados;
    } 

}