public class Demo12 {

      public static void main(String[] args) throws IOException {

          File file=new File("1.txt");

         FileInputStream fis=new FileInputStream(file);

         FileOutputStream fos=new FileOutputStream(new File("4.txt"));

         byte[] bt=new byte[1024];

         int count;

         while((count=fis.read(bt))!=-1) {

            fos.write(bt,0,count);

       }

        fis.close();

        fos.close();

    }

 }