使用BufferedReader和BufferedInputStream读取文件有什么区别

Question

当我通过一个程序来阅读文件时，我有一个疑问。我们可以使用BufferedReader读取文件，如下所示

package com.mkyong.io;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class BufferedReaderExample {

    public static void main(String[] args) {

        BufferedReader br = null;

        try {

            String sCurrentLine;

            br = new BufferedReader(new FileReader("C:\\testing.txt"));

            while ((sCurrentLine = br.readLine()) != null) {
                System.out.println(sCurrentLine);
            }

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (br != null)br.close();
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }

    }
}

我们也可以使用BufferedInputStream读取文件，如下所示

package com.mkyong.io;

import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

public class BufferedInputStreamExample {

    public static void main(String[] args) {

        File file = new File("C:\\testing.txt");
        FileInputStream fis = null;
        BufferedInputStream bis = null;
        DataInputStream dis = null;

        try {
            fis = new FileInputStream(file);

            bis = new BufferedInputStream(fis);
            dis = new DataInputStream(bis);

            while (dis.available() != 0) {
                System.out.println(dis.readLine());
            }

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                fis.close();
                bis.close();
                dis.close();
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
    }
}

所以我怀疑使用BufferedReader和BufferedInputStream有什么不同，而且效率更高