如何检查javafx中的主目录和子目录中没有两个同名文件

import java.io.File;
import java.util.HashSet;
import java.util.Set;

public class FileDuplicateChecker {
    private Set<String> fileNames = new HashSet<>();

    public boolean hasDuplicateFiles(File directory) {
        if (directory.isDirectory()) {
            for (File file : directory.listFiles()) {
                if (file.isDirectory()) {
                    if (hasDuplicateFiles(file)) {
                        return true;
                    }
                } else {
                    String fileName = file.getName();
                    if (fileNames.contains(fileName)) {
                        return true;
                    }
                    fileNames.add(fileName);
                }
            }
        }
        return false;
    }

    public static void main(String[] args) {
        File directory = new File(System.getProperty("user.home"));
        FileDuplicateChecker checker = new FileDuplicateChecker();
        boolean hasDuplicate = checker.hasDuplicateFiles(directory);
        if (hasDuplicate) {
            System.out.println("存在两个同名文件。");
        } else {
            System.out.println("不存在两个同名文件。");
        }
    }
}