If file is null this constructor throws NullPointerException but
specification does not say about it.

The Java Language Specification Version 1.0


22.16.2 public FileOutputStream(File file)
throws SecurityException, FileNotFoundException

This constructor initializes a newly created FileOutputStream by opening a connection to an actual file, the file
named by file in the file system. A new FileDescriptor object is created to represent this file connection.

First, if there is a security manager, its checkWrite method (§20.17.21) is called with the path represented by the
file argument as its argument.

If the actual file cannot be opened, a FileNotFoundException is thrown.

_______________________Example ______________________________________

import java.io.*;

public class badtests {

  public static void main( String argv[] ) {

   File f=null;
   FileOutputStream testfile;
 
    try {
    testfile=new FileOutputStream(f);
    }
  catch (SecurityException e)
  {System.out.println("SecurityException - all OK !");}

  catch (FileNotFoundException e)
  {System.out.println("FileNotFoundException - all OK !");}
 
  catch (Exception e)
  {System.out.println(" Unexpected "+e+" thrown ");}

  }

}

______________________ Output ______________________________________

Unexpected java.lang.NullPointerException thrown
_____________________________________________________________________