Re: what the problem about this short code?

From:
Jussi Piitulainen <jpiitula@ling.helsinki.fi>
Newsgroups:
comp.lang.java.programmer
Date:
14 Apr 2007 13:37:47 +0300
Message-ID:
<qotwt0f6y2s.fsf@venus.ling.helsinki.fi>
dolphin writes:

import javax.media.Manager;

import javax.media.bean.playerbean.MediaPlayer;
import java.lang.String;

public class Player1 {
    MediaPlayer mp1 = new MediaPlayer();
    public Player1(){
    mp1.setMediaLocation(new String("file:\\d:\\music\\11.wma"));
    }
    public static void main(String[] args){
        Player1 player1=new Player1();
        player1.mp1.start();
    }
    }

it says that Cannot find a Player for :file:\d:\music\11.wma.what
the problem?


I don't know about media players, but I have a couple of suggestions.

First, importing any java.lang.* class is redundant in a bad way: it
doesn't affect the meaning of the program, but it leaves a reader of
the code looking for an explanation.

Second, never write

 new String("foo")

for any literal "foo". Instead, write just

 "foo"

and it will be a perfectly adequate String. Or if you are trying to
appear paranoid, consider something like this:

 (String)new String(new String((String)((String)"foo").toString()))

Well, just don't.

Third, and this may actually help you, you can write an even simpler
test program and so eliminate some possibilities of error:

import javax.media.Manager;
import javax.media.bean.playerbean.MediaPlayer;

public class Player1 {
  public static void main(String[] args) {
     MediaPlayer mp1 = new MediaPlayer();
     mp1.setMediaLocation("file:\\d:\\music\\11.wma");
     mp1.start();
  }
}

Oh, and please, include the actual error message. Cut and paste, or
otherwise copy it _exactly_. Any paraphrase is likely to distort it
when you don't already know what the message means.

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