Java code explainers

public class DuplicateFinder {
 
    public Map<String, List<Path>> findDuplicates(Path root) throws IOException {
        Map<String, List<Path>> byHash = new HashMap<>();

@Component
public class OrderRecoveryHandler {
 
    private final RabbitTemplate rabbitTemplate;

@Component
public class CorrelationIdWebFilter implements WebFilter, Ordered {
 
    public static final String CORRELATION_ID_HEADER = "X-Correlation-Id";

public final class DeepCopier {
 
    private static final ObjectMapper MAPPER = new ObjectMapper()
            .registerModule(new JavaTimeModule())

package com.example.time;
 
import java.time.Duration;
import java.time.Instant;

@Component
public class InventoryReconciliationJob {
 
    private static final Logger log = LoggerFactory.getLogger(InventoryReconciliationJob.class);

import java.util.Comparator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.regex.Pattern;

public final class HttpHeaders {
 
    private final NavigableMap<String, List<String>> values =
            new TreeMap<>(String.CASE_INSENSITIVE_ORDER);

public record ServerConfig(
        String host,
        int port,
        Duration timeout,

public final class IbanValidator {
 
    private static final Map<String, Integer> COUNTRY_LENGTHS = Map.ofEntries(
        Map.entry("DE", 22), Map.entry("FR", 27), Map.entry("GB", 22),

@Configuration
@EnableWebSecurity
public class OAuth2SecurityConfig {
 

@RestController
@RequestMapping("/api/reports")
public class OrderReportController {
 

public class SlidingLogRateLimiter {
 
    private final int maxRequests;
    private final long windowMillis;

public final class Slugifier {
 
    private static final Pattern NON_LATIN = Pattern.compile("[^\\w-]");
    private static final Pattern WHITESPACE = Pattern.compile("[\\s]+");

@Repository
public interface OrderRepository extends JpaRepository<Order, Long> {
 
    @Query("""

public record FixedWidthField(String name, int start, int end) {
 
    public String extract(String line) {
        int from = Math.min(start, line.length());

@RestController
@RequestMapping("/api/quotes")
public class QuoteStreamController {
 

@Controller
public class BookController {
 
    private final BookService bookService;