Delete a file

import java.io.File;

public class Main {
  public static void main(String[] args) {
    String fileName = "file.txt";
    File f = new File(fileName);

    if (!f.exists())
      throw new IllegalArgumentException("Delete: no such file or directory: "
          + fileName);

    if (!f.canWrite())
      throw new IllegalArgumentException("Delete: write protected: " + fileName);

    // If it is a directory, make sure it is empty
    if (f.isDirectory()) {
      String[] files = f.list();
      if (files.length > 0)
        throw new IllegalArgumentException("Delete: directory not empty: "
            + fileName);
    }

    // Attempt to delete it
    boolean success = f.delete();

    if (!success)
      throw new IllegalArgumentException("Delete: deletion failed");
  }
}