1. import java.util.HashMap;
  2. import java.util.Map;
  3. import java.util.Scanner;
  5. public class CLIArgParser {
  7. public static void main(String[] args) {
  9. // Define default values for arguments
  10. Map<String, Object> defaults = new HashMap<>();
  11. defaults.put("name", "World");
  12. defaults.put("age", 0);
  13. defaults.put("city", "Unknown");
  14. defaults.put("debug", false);
  16. // Parse command line arguments
  17. Map<String, Object> parsedArgs = parseArgs(args, defaults);
  19. // Access and print the parsed arguments
  20. System.out.println("Name: " + parsedArgs.get("name"));
  21. System.out.println("Age: " + parsedArgs.get("age"));
  22. System.out.println("City: " + parsedArgs.get("city"));
  23. System.out.println("Debug: " + parsedArgs.get("debug"));
  24. }
  26. public static Map<String, Object> parseArgs(String[] args, Map<String, Object> defaults) {
  27. Map<String, Object> parsedArgs = new HashMap<>(defaults); // Start with default values
  28. Scanner scanner = new Scanner(System.in);
  30. String arg;
  31. while ((arg = scanner.nextLine()) != null) {
  32. String[] parts = arg.split("=");
  33. if (parts.length == 2) {
  34. String key = parts[0].trim();
  35. String value = parts[1].trim();
  37. if (parsedArgs.containsKey(key)) {
  38. try {
  39. // Attempt to parse value to appropriate type
  40. Object parsedValue = parseValue(value);
  41. parsedArgs.put(key, parsedValue);
  42. } catch (Exception e) {
  43. System.err.println("Error parsing value for " + key + ": " + value);
  44. // Keep default value
  45. }
  46. } else {
  47. parsedArgs.put(key, value);
  48. }
  49. } else if (arg.trim().equalsIgnoreCase("--help")) {
  50. printHelp();
  51. return parsedArgs; // Exit after printing help
  52. }
  53. }
  55. return parsedArgs;
  56. }
  58. private static Object parseValue(String value) {
  59. if (value.equalsIgnoreCase("true") || value.equalsIgnoreCase("1")) {
  60. return true;
  61. } else if (value.equalsIgnoreCase("false") || value.equalsIgnoreCase("0")) {
  62. return false;
  63. } else {
  64. try {
  65. return Integer.parseInt(value);
  66. } catch (NumberFormatException e) {
  67. try {
  68. return Double.parseDouble(value);
  69. } catch (NumberFormatException e2) {
  70. return value; // Treat as string
  71. }
  72. }
  73. }
  74. }
  76. private static void printHelp() {
  77. System.out.println("Usage: CLIArgParser [options]");
  78. System.out.println("Options:");
  79. System.out.println(" --help Display this help message");
  80. System.out.println(" --name Specify a name (default: World)");
  81. System.out.println(" --age Specify an age (default: 0)");
  82. System.out.println(" --city Specify a city (default: Unknown)");
  83. System.out.println(" --debug Enable debug mode (default: false)");
  84. }
  85. }

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