请检查作业，有什么需要改进吗？

package io;

import java.io.*;

public class Exe {
    public void transWriteByBuf(){
        Writer writer = null;
        BufferedWriter bw = null;
        File file = new File("d:/hello");
        try {
            if (!file.exists()) {
                file.createNewFile();
            }
            writer = new FileWriter(file);
            bw = new BufferedWriter(writer);
            bw.write("你好吗？\n我很好！");
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                if (bw != null) {
                    bw.close();
                }
                if (writer != null) {
                    writer.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    public void transReadByBuf(){
        Reader reader = null;
        BufferedReader br = null;
        File file = new File("d:/hello");
        try {
            reader = new FileReader(file);
            br = new BufferedReader(reader);
            while (br.ready()) {
                System.out.println(br.readLine());
            }
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                if (br != null) {
                    br.close();
                }
                if (reader != null) {
                    reader.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    public static void main(String[] args) {
        Exe e = new Exe();
        e.transWriteByBuf();
        e.transReadByBuf();
    }
}