第四周作业

很明显提高了复制的时间
import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

 

public class CopyFile{

long a=System.currentTimeMillis();

public void fz(){

try

{

FileInputStream fis =new FileInputStream("a.mp3");

FileOutputStream fos =new FileOutputStream("f.mp3");

int read=fis.read();

byte[] buf = new byte[1024*1000];

int len = 0 ;

while((len=fis.read(buf)) != -1){ fos.write(buf,0,len);

}

fis.close();

fos.close();

} catch (IOException e) {

            e.printStackTrace();
        }System.out.println("耗时 : "+(System.currentTimeMillis()-a)/1000f+" 秒 ");
}
public static void main(String []args){
   CopyFile cf= new CopyFile();
   cf.fz():
}

}