题目内容

1、以下选项中关于如下代码的说法正确的是（）。（选择二项）public class TestBuffered {public static void main(String[] args) throws IOException {BufferedReader br =new BufferedReader(new FileReader("d:/bjsxt1.txt"));BufferedWriter bw =new BufferedWriter(new FileWriter("d:/bjsxt2.txt"));String str = br.readLine();while(str !=null){bw.write(str);bw.newLine();str = br.readLine();}br.close();bw.close();}}

A. 该类使用字符流实现了文件复制，将d:/bjsxt1.txt复制为d:/bjsxt2.txt
B. FileReader和FileWriter是处理流，直接从文件读写数据
C. BufferedReader和BufferedWriter是节点流，提供缓冲区功能，提高读写效率
D. readLine()可以读取一行数据，返回值是字符串类型，简化了操作

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1、BufferedReader和BufferedWriter是具有缓冲功能的流，使用它们可以提高读写效率。

A. 对
B. 错

2、BufferedReader类的readLine()方法，如果读到流的末尾，该方法返回的结果为null。

A. 对
B. 错

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