APPLETS AND MULTIMEDIA - Introduction to Java Programming - page 693

4 public DisplayImageWithURL() {
5 java.net.URL url =

this .getClass().getResource( "image/us.gif" )

;

get image URL
create a label 6 add( new JLabel( new ImageIcon(url) ));

7 }
8 }

main method omitted

If you replace the code in lines 5-6 with the following code,

add( new JLabel( new ImageIcon( "image/us.gif" )));

you can still run the program as a standalone application, but not as an applet from a browser,
as shown in Figure 18.13.

F IGURE 18.13

The applet loads an image from an image file located in the same directory as the applet.

18.22

✓ ✓

How do you create a URL object for the file image/us.gif in the class directory?

Check

18.23

How do you create an ImageIcon from the file image/us.gif in the class directory?

Point

18.11 Playing Audio in Any Java Program
The Applet class contains the methods for obtaining an AudioClip object for an
audio file. The AudioClip object contains the methods for playing audio files.

Key
Point

There are several formats for audio files. Java programs can play audio files in the WAV,
AIFF, MIDI, AU, and RMF formats.
To play an audio file in Java (application or applet), first create an audio clip object for the file.
The audio clip is created once and can be played repeatedly without reloading the file. To create
an audio clip, use the static method newAudioClip() in the java.applet.Applet class:

AudioClip audioClip = Applet.newAudioClip(url);

Audio originally could be played only from Java applets. For this reason, the AudioClip inter-
face is in the java.applet package. Since JDK 1.2, audio can be played in any Java program.
The following statements, for example, create an AudioClip for the beep.au audio file
in the class directory:

Class metaObject = this .getClass();
URL url = metaObject.getResource( "beep.au" );
AudioClip audioClip = Applet.newAudioClip(url);