This might seem out of place in the midst of all this
Graphics
code, but there’s a pattern.
We’re moving from the simpler graphical forms to more dynamic
multimedia. You can play a sound file using an
AudioClip
to represent it. Back in the days of 1.0
and 1.1, you could do this only in an applet (or using unsupported
sun.java
classes). But with Java 2, this
capability was extended to applications. Here is a program that plays
either two demonstration files from a precompiled list,
or the list of files you give. Due to
the applet legacy, each file must be given as a URL.
import java.applet.*; import java.net.*; /** Simple program to try out the "new Sound" stuff in JDK1.2 -- * allows Applications, not just Applets, to play Sound. */ public class SoundPlay { static String defSounds[] = { "file:///javasrc/graphics/test.wav", "file:///music/midi/Beet5th.mid", }; public static void main(String[] av) { if (av.length == 0) main(defSounds); else for (int i=0;i<av.length; i++) { System.out.println("Starting " + av[i]); try { URL snd = new URL(av[i]); // open to see if works or throws exception, close to free fd's // snd.openConnection().getInputStream().close( ); Applet.newAudioClip(snd).play( ); } catch (Exception e) { System.err.println(e); } } // With this call, program exits before/during play. // Without it, on some versions, program hangs forever after play. // System.exit(0); } }
As the code comment reports, you can open the URL to see if it
succeeds; if this throws an IOException
, there is
not much point in trying the newAudioClip( )
call,
and catching it this way might allow you to print a better error
message.
There are several limitations on the applet sound API. The JMFPlayer interface discussed in Section 12.9 plays sound files with a volume control panel.
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