private static void io1() {
		Writer out = null;
		try {
			out = new BufferedWriter(new FileWriter(filePath));
			out.write(content);
		} catch (IOException e) {
			throw new RuntimeException(e);
		} finally {
			if (out != null) {
				try {
					out.close();
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			}
		}

		sb.setLength(0);

		BufferedReader in = null;
		try {
			in = new BufferedReader(new FileReader(filePath));

			String l;
			while ((l = in.readLine()) != null) {
				sb.append(l);
				sb.append(lineSeparator);
			}
		} catch (FileNotFoundException e) {
			throw new RuntimeException(e);
		} catch (IOException e) {
			throw new RuntimeException(e);
		} finally {
			if (in != null) {
				try {
					in.close();
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			}
		}

		System.out.print(sb.toString());
	}