Java列出目录下的文件，通过本例可以掌握Java中如何增加组件到容器、如何设置边界、取得目录内容的事件处理、调用显示目录内容方法、取得目录内容、用路径实例化一个文件对象（重点是取得目录内所有文件列表）、实例化一个StringBuffer,用于处理显示的字符串、增加目录标识等-Java lists the files in that directory, and Java, this case can grasp how to increase the component to the container, how to set boundaries, to obtain the contents of the directory of the event handler, call to display the contents of the directory to obtain the contents of the directory path to instantiate a file object (the key is to get a list of all files in the directory), instantiate a StringBuffer for string processing and display, and increase the catalog identifies the