Name: akC57697 Date: 05/21/98



The java.io.File.list(null) returns null.

The doc:
" .....
  If the given filter is null then all names are accepted.
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  Otherwise, a name satisfies the filter if and only if the value
  true results when the FilenameFilter#accept method of the filter
  is invoked on this abstract pathname and the name of a file or
  directory in the directory that it denotes.
  @return ... The array will be empty if
           the directory is empty or if no names were accepted by the
           filter. Returns null if this abstract pathname
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
           does not denote a directory, or if an I/O error occurs.
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  .....
"

The source code of java.io.File "@(#)File.java 1.70 98/05/13" :
"
    public String[] list(FilenameFilter filter) {
String names[] = list();
if ((names == null) || (filter == null)) { <--
return null;
}
    ...
"
---------------------8-<----------------------
import java.io.File;
public class Test {
    public static void main(String s[]) {
 
  try {
   File l=new File("/");
   System.out.println("The list: "+l.list(null));
  } catch (Exception e) { System.out.println(e);}
   }
}
--------------------->-8----------------------
Output:
(###@###.###): java -fullversion
java full version "JDK-1.2beta4-F"
(###@###.###): java Test
The list: null

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