import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class Test {


    public static void main(String[] args) throws IOException {
        
        FileInputStream aa = new FileInputStream ("D:\\1.txt");
        FileOutputStream bb = new FileOutputStream ("D:\\2.txt");
        
        BufferedInputStream mm = new BufferedInputStream (aa);
        BufferedOutputStream nn = new BufferedOutputStream( bb);
        
        byte [] cc = new byte [1024];
        int len = mm.read (cc);
        if (-1 != len)
        {
            nn.write (cc);
        }
        nn.close();
        mm.close ();
    }
}