Boa noite, A chave fica exposta dessa forma? Ou deveria ter feito de outra forma?
import java.io.IOException;
import java.net.URI;
import java.net.URLEncoder;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.util.Scanner;
public class BuscadorDeLivros {
    public static void main(String[] args) throws IOException, InterruptedException {
        Scanner leitorDeLivros = new Scanner(System.in);
        System.out.println("Digite o nome do Livro : ");
        var nomeDoLivro = leitorDeLivros.nextLine();
        String endereco = "https://www.googleapis.com/books/v1/volumes?q=" + URLEncoder.encode(nomeDoLivro, "UTF-8") + "&apikey=0000000";
        HttpClient client = HttpClient.newHttpClient();
        HttpRequest request = HttpRequest.newBuilder()
                .uri(URI.create(endereco))
                .build();
        HttpResponse<String> response = client
                .send(request, HttpResponse.BodyHandlers.ofString());
        System.out.println(response.body());
    }
}
 
            