# 具体遇到的问题
# 报错信息的截图

# 相关课程内容截图
# 尝试过的解决思路和结果

# 粘贴全部相关代码，切记添加代码注释（请勿截图）

package com.zhong.file;

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.util.Random;

public class Test3_16 {

public static void main(String[] args) {

// TODO Auto-generated method stub

try {

FileInputStream fis1=new FileInputStream("one.txt");

FileOutputStream fos1=new FileOutputStream("one.txt");

String str="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";

    Random random=new Random();

    long startTime1=System.currentTimeMillis();

    int n=0;

for(int i=0;i<100000;i++){//写

fos1.write(str.charAt(random.nextInt(62)));

}

long endTime1=System.currentTimeMillis();

long dif1=endTime1-startTime1;

System.out.println("one.txt不使用缓冲流来写");

System.out.println("用时为："+dif1);

FileInputStream fis2=new FileInputStream("two.txt");

FileOutputStream fos2=new FileOutputStream("two.txt");

BufferedInputStream bis=new BufferedInputStream(fis2);

BufferedOutputStream bos=new BufferedOutputStream(fos2);

long startTime2=System.currentTimeMillis();

for(int i=0;i<100000;i++){//写

bos.write(str.charAt(random.nextInt(62)));

}

long endTime2=System.currentTimeMillis();

long dif2=endTime2-startTime2;

System.out.println("two.txt使用缓冲流来写");

System.out.println("用时为："+dif2);

System.out.println("节省时间："+(dif1-dif2));

fis1.close();

fos1.close();

fis2.close();

fos2.close();

bis.close();

bos.close();

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e){

e.printStackTrace();

}

}

}