I just need some help figuring out how to solve this, cause I'm stuck.

Error: java.lang.Comparable cannot be inherited with different
arguments: <> and <java.io.File>

<------------ Code ------------>

import java.util.*;
import java.io.File;
import java.text.Collator;

import javax.swing.tree.TreeModel;
import javax.swing.tree.TreePath;
import javax.swing.event.TreeModelListener;
import javax.swing.event.TreeModelEvent;
 private class FileTreeNode extends File implements Comparable
 {
   public FileTreeNode(File file)
   {
     super(file, "");
   }

   /**
    * Compare two FileTreeNode objects so that directories
    * are sorted first.
    *
    * @param object  Object to compare to.
    * @return        Compare identifier.
    */
   public int compareTo (Object object)
   {
     File file1 = this;
     File file2 = (File) object;

     Collator collator = Collator.getInstance();

     if (file1.isDirectory() && file2.isFile())
       return -1;
     else if (file1.isFile() && file2.isDirectory())
       return +1;
     else
       return collator.compare(file1.getName(), file2.getName());
   }