曾经看到有个老师这样写资源关闭，
我的疑问是资源都关闭了（ bufferedReader.close();），那这句 bufferedReader = null;还有没有必要写？另外，毕向东老师的视频里好像没有这样写过！
请指教！
public class BufferCopy {
public static void main(String[] args) {
BufferedReader bufferedReader = null;
BufferedWriter bufferedWriter = null;
try {
bufferedReader = new BufferedReader(new FileReader("G:/a.txt"));
bufferedWriter = new BufferedWriter(new FileWriter("H:/a.txt"));
String lines = null;
while ((lines = bufferedReader.readLine()) != null) {
bufferedWriter.write(lines);
bufferedWriter.newLine();
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally{
if (bufferedWriter != null) {
try {
bufferedWriter.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (bufferedReader != null) {
try {
bufferedReader.close();
// bufferedReader = null;
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
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