try
    {
      FileInputStream inStream = new FileInputStream( args[0] );
      inStream = ("myFile.txt");
    }
    catch(IOException ioerr)
    {
      System.out.println( ioerr.toString() );
    }

##</code><code>##

open(FH,"myFile.txt") or die "Nope : $!\n";

##</code><code>##

die "Nope : $!\n" unless open(FH,"myFile.txt");

##</code><code>##

if (not open FH, 'myFile.txt')
{
    print STDERR "Nope : $!\n";
    exit;
}

##</code><code>##

!open FH => 'myFile.txt' == 0 && die "Nope : $!\n";