摘要： File类示例public class FileUsageTest { private static void usage() { System.err.println("Usage: FileUsageTest path1 ... \n" + "Creates each path\n" + "Usage: FileUsageTest -d path1 ...\n" + "Deletes each path\n" + "Usage: FileUsageTest -r path1 path2\n" 阅读全文