import java.io.*;
public class TestBufferStream1 {
  public static void main(String[] args) {
    try {
      FileInputStream fis = 
              new FileInputStream("d:\\share\\java\\HelloWorld.java");
      BufferedInputStream bis = 
              new BufferedInputStream(fis);
      
 
int c = 0;
      System.out.println(bis.read());
      System.out.println(bis.read());
      bis.mark(100);
      for(int i=0;i<=10 && (c=bis.read())!=-1;i++){
        System.out.print((char)c+" ");
      }
      System.out.println(); 
      bis.reset();
      for(int i=0;i<=10 && (c=bis.read())!=-1;i++){
        System.out.print((
 
char)c+" ");
      }
      bis.close();
    } catch (IOException e) {e.printStackTrace();}
  }
}

bufferedReader有readLine()方法，可以一次讀一行，bufferedWriter的newLine()方法可以一次寫一個空行

import java.io.*;
public class TestBufferStream2 {
  public static void main(String[] args) {
    try {
      BufferedWriter bw 
 
= new BufferedWriter(new FileWriter("d:\\share\\java\\dat2.txt"));
      BufferedReader br = new BufferedReader(
             new FileReader("d:\\share\\java\\dat2.txt"));
      String s = null;
      for(int i=1;i<=100;i++){
        s = String.valueOf(Math.random());
        bw.write(s);
        bw.newLine();
      }
      bw.flush();
      while((s=br.readLine())!=null){
        System.out.println(s);
      }
      bw.close(); 
      br.close();
    } catch (IOException e) { e.printStackTrace();}
  }
}