Arquivo em memoria

arq.createNewFile();
			Reader cin = new FileReader(arq);
			cin = new StringReader(reader);//clob.getCharacterStream();
			Writer out = new FileWriter(arq);
			int charsRead = 0;
			
			while((charsRead = cin.read(cbuf)) != -1){
				out.write(cbuf, 0, charsRead);
			}
			
			cin.close();
			out.close();