A science teacher agent written in Java, using ADK (Agent Development Kit)

ScienceTeacherAgent.java

package agents;

import static java.nio.charset.StandardCharsets.UTF_8;
import java.util.Scanner;

import com.google.adk.agents.BaseAgent;
import com.google.adk.agents.LlmAgent;
import com.google.adk.events.Event;
import com.google.adk.runner.InMemoryRunner;
import com.google.adk.sessions.Session;
import com.google.genai.types.Content;
import com.google.genai.types.Part;

import io.reactivex.rxjava3.core.Flowable;

/** Science teacher agent. */
public class ScienceTeacherAgent {

    public static BaseAgent ROOT_AGENT = initAgent();

    public static BaseAgent initAgent() {
        return LlmAgent.builder()
            .name("science-app")
            .description("Science teacher agent")
            .model("gemini-2.0-flash")
            .instruction("""
                You are a helpful science teacher that explains
                science concepts to kids and teenagers.
                """)
            .build();
    }

    public static void main(String[] args) {
        InMemoryRunner runner = new InMemoryRunner(ROOT_AGENT);

        Session session = runner
                .sessionService()
                .createSession(runner.appName(), "student")
                .blockingGet();

        try (Scanner scanner = new Scanner(System.in, UTF_8)) {
            while (true) {
                System.out.print("\nYou > ");
                String userInput = scanner.nextLine();
                if ("quit".equalsIgnoreCase(userInput)) {
                    break;
                }

                Content userMsg = Content.fromParts(Part.fromText(userInput));
                Flowable<Event> events =
                    runner.runAsync(session.userId(), session.id(), userMsg);

                System.out.print("\nAgent > ");
                events.blockingForEach(event -> {
                    System.out.println(event.stringifyContent());
                });
            }
        }
    }
}