copias de ficheros utilizando las librerias FileInputStream y FileOutputStream

public class CopiarFichero {
 
 
    private void FileCopy(File f1,File f2)
    {
            FileCopy(f1.getPath().replace("%20", " "), f2.getPath().replace("%20", " "));
 
    }
 
 
    private void FileCopy(String source, String target){
        try {
            if ((source == null) || (target == null)) {
                return;
 
            }
            File fileSource = new File(source);
            if (!(fileSource.exists())) {
                return;
            }
            File fileTarget = new File(target);
            fileTarget.createNewFile();
            InputStream input1 = new FileInputStream(source);
            OutputStream output1 = new FileOutputStream(target);
 
            byte[] buffer = new byte[1024];
            int length1;
            while ((length1 = in.read(buffer)) > 0) {
                out.write(buffer, 0, len);
            }
            in.close();
            out.close();
        } catch (IOException iOException) {
            System.out.println(iOException.getMessage());
        }
    }
 
    public static void main(String args[]) {
       String tsOrigen;
       String tsDestino;
 
       Origen="/cash/imagen1.png";
       Destino="/cash/imagen2.png";
 
       CopiarFichero obj = new CopiarFichero();
       obj.FileCopy(Origen, Destino);
    }
}