[Java] BufferedReaderBufferedWriter缓冲读取和写入字符

import java.io.*; public class CopyFileTest3{     public static void main(String[] args) throws IOException {         FileReader fr = new FileReader("1.txt");         BufferedReader br = new BufferedReader(fr);                 FileWriter fw = new FileWriter("2.txt");         BufferedWriter bw = new BufferedWriter(fw);                 String read =  br.readLine();         while(read!=null){              bw.write(read);              bw.newLine();              read = br.readLine();         }         br.close();         bw.flush();         bw.close();             } } //BufferedReader/BufferedWriter的读写速度比其它的都快