Musterabgleich im Switch für den Kontrollfluss in Spring Services

public sealed interface OrderEvent permits OrderCreated, OrderPaid, OrderCancelled {}
public record OrderCreated(String orderId) implements OrderEvent {}
public record OrderPaid(String orderId, double amount) implements OrderEvent {}
public record OrderCancelled(String orderId, String reason) implements OrderEvent {}
 
@Service
public class OrderWorkflowService {
    public String handleEvent(OrderEvent event) {
        return switch (event) {
            case OrderCreated c -> "Initializing order: " + c.orderId();
            case OrderPaid p when p.amount() > 10_000.0 -> "High-value payment received for: " + p.orderId();
            case OrderPaid p -> "Standard payment processed for: " + p.orderId();
            case OrderCancelled c -> "Order aborted due to: " + c.reason();
        };
    }
}