package com.io;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.File;import java.io.FileReader;import java.io.FileWriter;import java.io.IOException;import org.junit.Test;public class 缓冲字符流 {        @Test    public void bufferedReaderTest(){        File file = new File("hello.txt");        FileReader fr = null;        BufferedReader br = null;        try {            fr = new FileReader(file);            br = new BufferedReader(fr);            /**             * 使用旧的方法，读到一个char数组，不写了             * 下面使用readline方法，最后一行返回null             */            String str;            while((str = br.readLine()) != null){                System.out.println(str);            }                                }  catch (IOException e) {            e.printStackTrace();        }finally{            try {                br.close();            } catch (IOException e) {                e.printStackTrace();            }        }    }        @Test    public void bufferedWriterTest(){        File file = new File("hello.txt");        File fileOut = new File("bf_reader.txt");        FileReader fr = null;        FileWriter fw = null;                        BufferedReader br = null;        BufferedWriter bw = null;        try {            fr = new FileReader(file);            br = new BufferedReader(fr);                        fw = new FileWriter(fileOut);            bw = new BufferedWriter(fw);            /**             * 使用旧的方法，读到一个char数组，不写了             * 下面使用readline方法，最后一行返回null             */            String str;            while((str = br.readLine()) != null){                bw.write(str);                bw.newLine();//换行                bw.flush();//flush            }                                }   catch (IOException e) {            e.printStackTrace();        }finally{            //先关输出流            try {                bw.close();            } catch (IOException e) {                e.printStackTrace();            }                        try {                br.close();            } catch (IOException e) {                e.printStackTrace();            }        }        }}