I let my class implement the FilenameFilter interface and override the boolean
accept(File,String)-method. Even if I let this function return false in every
case, still all files in the directory are displayed. Here is some code:

//open method
String open()
{
 java.awt.FileDialog a=new java.awt.FileDialog
 (
  frame,
  "Open een .jpg of .img file",
  java.awt.FileDialog.LOAD
 );
 a.setFilenameFilter(this);
 a.setVisible(true);
 return a.getFile();
}

//accept, doesn't work
public boolean accept(java.io.File a,String b)
{
 return false;
}