O mais difícil foi permitir a chave api, mas deu certo.

import java.io.IOException; import java.net.URI; import java.net.http.HttpClient; import java.net.http.HttpRequest; import java.net.http.HttpResponse; import java.util.Scanner;

public class BuscaLivros { public static void main(String[] args) throws IOException, InterruptedException { Scanner leitura = new Scanner(System.in);

System.out.println("Digite o livro que quer buscar:");
var busca = leitura.nextLine();

String chave = "AIzaSyAHsA_uD5-PnHgTPU-X6KZ3OgZOLfhKv24";

String endereco = "https://www.googleapis.com/books/v1/volumes?q=" + busca + "&key=" + chave;

    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());
}

}