Finding local files

You want to write a small program which will print only the local files in a given directory. You have been able to retrieve the list of elements in the directory, stored in DIRECTORY_CONTENT, but :

All elements contain first the type, then the element
/d means directory,
/f means file
Some files are hidden, and contain a "."
Files in other directors should not be printed Let's fix those now!

Bài tập này là một phần của khóa học

Intermediate Java

Xem khóa học

Hướng dẫn bài tập

Use .substring(a,b) and .contains("") to check if the element if file or directory.
Check whether a file is hidden when it containsa ".".
Check that a file is local by making sure it doesn't contain a "/".
Use the correct logical operator to use both conditions at the same time.

Bài tập tương tác thực hành trực tiếp

Hãy thử làm bài tập này bằng cách hoàn thành đoạn mã mẫu này.

class ls {
  static boolean isFile(String elem) {
    // Check that the first 3 characters of the element contain /f as a substring
    return elem.____(0, 3).____("/f");
  }
  
  static boolean isHidden(String elem) {
    // Use the appropriate method to make sure that file is hidden
    return elem.____(".");
  }

  static boolean isNonLocal(String elem) {
    // Use the correct method to determine whether a file is in a directory
    return elem.____(____, elem.length()).____(____);
  }

  public static void main(String[] args) {
    int hiddenCounter = 0, directoryCounter = 0, nestedCounter = 0;
    for (String elem : DIRECTORY_CONTENT) {
      if (isFile(elem)) {
        if (!isHidden(elem)) System.out.print(elem.substring(2));
          // Use a logical operator to make it correct
        else if (isHidden(elem) ____ !isNonLocal(elem)) hiddenCounter++;
        else nestedCounter++;
      } else directoryCounter++;
    }
    printer(hiddenCounter, directoryCounter, nestedCounter);
  }

  static String[] DIRECTORY_CONTENT = {"/d .Trash", "/f .history", "/d Applications", "/f tmp", "/f script", "/d Documents", "/f Documents/.bankAccounts", "/f .sshKeys", "/d Pictures", "/f content", "/f Documents/file"};

  static void printer(int hiddenCounter, int directoryCounter, int nestedCounter) {
    System.out.println();
    System.out.println("With :\n" + hiddenCounter + " hidden files,\n" + directoryCounter + " directories,\nAnd " + nestedCounter + " nested files");
  }
}

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