试题出自试卷《04747《Java语言程序设计（一）》真题及参考答案（2023.04）》

问题1选项
A.BufferedReader in = new BufferedReader(new Reader("a.dat"));
B.BufferedReader in = new BufferedReader(new FileReader("a.dat"));
C.BufferedReader in = new BufferedReader(new InputStream ("a.dat"));
D.BufferedReader in = new BufferedReader(new FileInputStream ("a.dat"));

B