コードの断片を考えると: public void recDelete (String dirName) throws IOException { File [ ] listOfFiles = new File (dirName) .listFiles(); if (listOfFiles ! = null && listOfFiles.length >0) { for (File aFile : listOfFiles) { if (aFile.isDirectory ()) { recDelete (aFile.getAbsolutePath ()); } else { if (aFile.getName ().endsWith (".class")) aFile.delete (); } } } } Assume that Projects contains subdirectories that contain .class files and is passed as an argument to the recDelete () method when it is invoked. 結果は何ですか?