1. import java.net.MalformedURLException;
  2. import java.net.URL;
  3. import java.util.ArrayList;
  4. import java.util.List;
  6. public class URLValidator {
  8. /**
  9. * Validates a list of URLs, returning a list of invalid URLs.
  10. * @param urlList The list of URLs to validate.
  11. * @return A list containing URLs that are invalid.
  12. */
  13. public static List<String> validateURLs(List<String> urlList) {
  14. List<String> invalidURLs = new ArrayList<>();
  16. if (urlList == null) {
  17. return invalidURLs; // Handle null input
  18. }
  20. for (String url : urlList) {
  21. try {
  22. new URL(url); // Attempt to create a URL object. Throws exception on invalid format
  23. } catch (MalformedURLException e) {
  24. invalidURLs.add(url); // Add the invalid URL to the list
  25. }
  26. }
  28. return invalidURLs;
  29. }
  31. public static void main(String[] args) {
  32. //Example Usage
  33. List<String> urls = new ArrayList<>();
  34. urls.add("https://www.google.com");
  35. urls.add("invalid-url");
  36. urls.add("http://example.com");
  37. urls.add("ftp://example.com"); //invalid url for web validation.
  38. urls.add("https://www.example.com/page?param=value"); //valid url
  39. urls.add(null);
  41. List<String> invalid = validateURLs(urls);
  42. System.out.println("Invalid URLs: " + invalid);
  43. }
  44. }

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