java语言IO流之BufferedOutputStream

import java.io.*;public class TestBufferedOutputStream { public static void main(String[] args) {  try {   BufferedWriter bw = new BufferedWriter(new FileWriter("D:\\java\\dat.txt"));   BufferedReader br = new BufferedReader(new FileReader("D:\\java\\dat.txt"));      String s = null;   for (int i=0; i<100; i++) {    s = String.valueOf(Math.random());    bw.write(s);    bw.newLine();   }   bw.flush();      while ((s = br.readLine()) != null) {    System.out.println(s);   }     br.close();    bw.close();  }catch (IOException e) {     e.printStackTrace();  } finally {    } }}