1. import java.util.HashMap;
  2. import java.util.Map;
  4. public class CommandLineOptions {
  6. private static Map<String, String> options = new HashMap<>();
  8. public static void processOptions(String[] args) {
  9. // Process command-line arguments
  10. for (int i = 0; i < args.length; i++) {
  11. String arg = args[i];
  13. if (arg.startsWith("--")) {
  14. String optionName = arg.substring(2); // Remove "--" prefix
  15. String optionValue = null;
  17. if (i + 1 < args.length) {
  18. optionValue = args[i + 1];
  19. i++; // Skip the value argument
  20. }
  22. options.put(optionName, optionValue);
  23. } else {
  24. // Handle non-option arguments (e.g., program name, input file)
  25. // Can be customized based on your program's needs.
  26. // For backward compatibility, treat as positional arguments if needed.
  27. // For example, if the first argument is always the input file:
  28. // if (i == 0) {
  29. // inputFilePath = args[i];
  30. // }
  31. }
  32. }
  33. }
  35. public static String getOption(String optionName) {
  36. return options.getOrDefault(optionName, null); // Return null if option not found
  37. }
  39. public static void main(String[] args) {
  40. processOptions(args);
  42. // Example usage
  43. if (getOption("input") != null) {
  44. System.out.println("Input file: " + getOption("input"));
  45. }
  46. if (getOption("verbose") != null) {
  47. System.out.println("Verbose mode: " + getOption("verbose"));
  48. }
  49. if (getOption("output") != null) {
  50. System.out.println("Output file: " + getOption("output"));
  51. }
  52. if (getOption("nonExistentOption") == null){
  53. System.out.println("nonExistentOption not found");
  54. }
  55. }
  56. }

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