java.io.bufferedOutputstream

import java.io.*;

public class bufferCompare {
    public static void main(String[] args)throws FileNotFoundException {
        long start=System.currentTimeMillis();
        try(
            FileInputStream fi=new FileInputStream("C:\dist\主函数.exe");
            FileOutputStream fo=new FileOutputStream("c:\dist\副本.exe");
            BufferedOutputStream bo=new BufferedOutputStream(fo);
            BufferedInputStream bi=new BufferedInputStream(fi);)
       {
//            int b=0;
//            while((b=fi.read())!=-1){
//                fo.write(b);}
           byte[]bytes=new byte[1024];
           int len=0;
           while((len=bi.read(bytes))!=-1){
               bo.write(bytes,0,len);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        long end=System.currentTimeMillis();
        System.out.println("程序运行时间："+(end-start)+"毫秒");
    }
}