A. FileReader; BufferedReader; C. FileInputStream; D. ObjectInputStream;
A. getPath(); B. getName(); C. isFile(); D. isAbsolute();
A. write(); B. flush(); C. close(); D. skip();
A. writeInt(); B. writeObject(); C. write(); D. writeUTF();
A. Runnable; B. ActionListener; C. WindowAdapter; D. Serializable;
A. DataOutputStream; B. FileOutputStream; C. BufferedOutputStream; D. PipedOutputStream;
A. FileOutputStream; B. FileWriter; C. BufferedWriter; D. OutputStream;
A. FileOutputStream; B. OutputStream; C. FileWriter; DataOutputStream;
A. 0; B. 1; C. -1; D. 不确定;
A. ObjectInputStream; B. ObjectReader; C. ObjectOutputStream; D. ObjectWriter;