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基于JMF类库的视频播放代码，简单明了！！！

程序中描述了子类对象构建调用父类的构造方法，以及类变量和实例变量创建的不同过程

The JavaTM Media Framework (JMF) is an application programming interface (API) for incorporating time-based media into Java applications and applets. This guide is intended for Java programmers who want to incorporate time-based media into their applications and for technology providers who are interested in extending JMF and providing JMF plug-ins to support additional media types and perform custom processing and rendering.