Java: splitting the filename into a base and extension

Source: http://www.java2s.com/Code/Java/File-Input-Output/Getextensionpathandfilename.htm

such an utility class :

class Filename {
  private String fullPath;
  private char pathSeparator, extensionSeparator;

  public Filename(String str, char sep, char ext) {
    fullPath = str;
    pathSeparator = sep;
    extensionSeparator = ext;
  }

  public String extension() {
    int dot = fullPath.lastIndexOf(extensionSeparator);
    return fullPath.substring(dot + 1);
  }

  public String filename() { // gets filename without extension
    int dot = fullPath.lastIndexOf(extensionSeparator);
    int sep = fullPath.lastIndexOf(pathSeparator);
    return fullPath.substring(sep + 1, dot);
  }

  public String path() {
    int sep = fullPath.lastIndexOf(pathSeparator);
    return fullPath.substring(0, sep);
  }
}

usage:

public class FilenameDemo {
  public static void main(String[] args) {
    final String FPATH = "/home/mem/index.html";
    Filename myHomePage = new Filename(FPATH, '/', '.');
    System.out.println("Extension = " + myHomePage.extension());
    System.out.println("Filename = " + myHomePage.filename());
    System.out.println("Path = " + myHomePage.path());
  }
}