说明：  编制一个声音播放控制程序，在Applet面板上安排“播放”和“停止”两个按钮，点击“播放”将播放声音，点击“停止”可停止播放。另外，Applet启动和离开时将自动播放和停止播放，要播放的声音文件名由Applet参数提供。
(The preparation of a sound player control procedures, in the panel arrangements Applet Play and stop two button, click Play will play a sound, click on Stop to stop playback. In addition, Applet start-up and leave will automatically play and stop play, to play the sound files provided by the Applet parameters.)