JAVA言語の作法について

BufferedReader reader;
BufferedWriter writer;

BufferedReader reader = null;
BufferedWriter writer = null;

if (reader != null ) {
    reader.close();
    reader=null; // Javaでは２度目のCloseは問題ないけど気持ち悪いので・・・これは自分の癖です。
}

private class NullReader extends Reader {
	public void close(){}
	public int read(char[] cbuf, int off, int len){
		return 0;
	}
}
private class NullWriter extends Writer {
	public void close(){}
	public void flush(){}
	public void write(char[] cbuf, int off, int len){}
}

public void extractFile() throws IOException {
	Reader reader = new NullReader();
	Writer writer = new NullWriter();
	try{
		reader = new BufferedReader(new FileReader(inputFileName));
		writer = new BufferedWriter(new FileWriter(outputFileName));
		boolean isToWrite = false;//書き出すべきか？
		String line;
		while ((line = ((BufferedReader)reader).readLine()) != null) {//EOFまで読み込み
			if (isToWrite) {//書き込みモードか？
				writer.write(line);
				((BufferedWriter)writer).newLine();
				if (p2.matcher(line).find()) {//終了文字列にマッチ
					isToWrite = false;
				}
				continue;
			}
			if (p1.matcher(line).find()) {//開始文字列にマッチ
				writer.write(line);
				((BufferedWriter)writer).newLine();
				isToWrite = true;
			}
		}
	}catch(FileNotFoundException e){
		throw e;
	}catch(IOException e){
		throw e;
	}finally{
		writer.close();
		reader.close();
	}
}