package io;
import java.io.*;

public class CopyFile {
    public static void main(String[] args) throws IOException{
        File src=new File("properties.txt");
        File des=new File("properties.back.txt");
        FileInputStream fis=new FileInputStream(src);
        FileOutputStream fos=new FileOutputStream(des);

        int data;
        while((data=fis.read())!=-1){
            fos.write(data);
        }
        fis.close();
        fos.close();

    }
}