Petit programme sympa pour Neiox.

Neiox.java

public class Neiox extends JFrame {
	
	private static final long serialVersionUID = 1L;
	public static final String TITLE = "%d nombre(s) présent(s)";
	public static final int MIN = 0;
	public static final int MAX = 9999;
	
	private List<String> data;
	
	public Neiox() throws IOException, URISyntaxException {
		data = readFile();
		refreshTitle();
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.getContentPane().setLayout(new GridBagLayout());
		
		final JSpinner numberSpinner = new JSpinner(new SpinnerNumberModel(MIN, MIN, MAX, 1));
		final JFormattedTextField field = ((NumberEditor)numberSpinner.getEditor()).getTextField();
		((NumberFormatter)field.getFormatter()).setAllowsInvalid(false);
		final GridBagConstraints constraints = new GridBagConstraints();
		constraints.gridx = 0;
		constraints.gridy = 0;
		constraints.insets = new Insets(10, 10, 10, 10);
		constraints.fill = GridBagConstraints.HORIZONTAL;
		this.add(numberSpinner, constraints);
		
		final JButton addButton = new JButton("Ajouter");
		addButton.addActionListener(new ActionListener() {

			@Override
			public final void actionPerformed(final ActionEvent event) {
				try {
					final String line = String.valueOf((Integer)numberSpinner.getValue());
					if(data.contains(line)) {
						JOptionPane.showMessageDialog(Neiox.this, "Ce nombre a déjà été ajouté !", "Erreur !", JOptionPane.ERROR_MESSAGE);
						return;
					}
					data.add(line);
					saveFile();
					numberSpinner.setValue(0);
					refreshTitle();
				}
				catch(final Exception ex) {
					ex.printStackTrace();
					JOptionPane.showMessageDialog(Neiox.this, ex.getClass().getName(), "Erreur !", JOptionPane.ERROR_MESSAGE);
				}
			}
			
		});
		constraints.gridy++;
		constraints.ipadx = 200;
		this.add(addButton, constraints);
		
		final JButton valuesButton = new JButton("Valeurs...");
		valuesButton.addActionListener(new ActionListener() {

			@Override
			public final void actionPerformed(final ActionEvent event) {
				new NumbersDialog().setVisible(true);
			}
			
		});
		constraints.gridy++;
		this.add(valuesButton, constraints);
		
		this.pack();
		this.setResizable(false);
		this.setLocationRelativeTo(null);
	}

	public static void main(final String[] args) {
		try {
			UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
			new Neiox().setVisible(true);
		}
		catch(final Exception ex) {
			ex.printStackTrace();
			JOptionPane.showMessageDialog(null, ex.getClass().getName(), "Erreur !", JOptionPane.ERROR_MESSAGE);
		}
	}
	
	public final void refreshTitle() {
		this.setTitle(String.format(TITLE, data.size()));
	}
	
	public final File getFile() throws IOException, URISyntaxException {
		final File parentFolder = new File(Neiox.class.getProtectionDomain().getCodeSource().getLocation().toURI()).getParentFile();
		final File file = new File(parentFolder, "data");
		if(!file.exists() || !file.isFile()) {
			file.createNewFile();
		}
		return file;
	}
	
	public List<String> readFile() throws IOException, URISyntaxException {
		final List<String> result = new ArrayList<String>();
		for(final String line : Files.readAllLines(getFile().toPath(), StandardCharsets.UTF_8)) {
			try {
				final int nombre = Integer.parseInt(line);
				if(nombre < MIN || nombre > MAX) {
					throw new NumberFormatException();
				}
				if(!result.contains(line)) {
					result.add(line);
				}
			}
			catch(final NumberFormatException ex) {
				JOptionPane.showMessageDialog(null, line + " n'est pas un entier valide !", "Erreur !", JOptionPane.ERROR_MESSAGE);
			}
		}
		return result;
	}
	
	public final void saveFile() throws IOException, URISyntaxException {
		if(data == null) {
			return;
		}
		Files.write(getFile().toPath(), data, StandardCharsets.UTF_8);
	}
	
	public class NumbersDialog extends JDialog {

		private static final long serialVersionUID = 1L;
		
		public NumbersDialog() {
			this.setTitle("Liste des nombres");
			this.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
			
			final DefaultTableModel model = new DefaultTableModel() {

				private static final long serialVersionUID = 1L;
				
				@Override
				public final boolean isCellEditable(final int row, final int column) {
					return false;
				}
				
			};
			model.setColumnIdentifiers(new String[]{"Nombre", "Présent ?"});
			for(int i = MIN; i <= MAX; i++) {
				final String line = String.valueOf(i);
				model.addRow(new String[]{line, data.contains(line) ? "Oui" : "Non"});
			}
			final JTable table = new JTable(model);
			table.setAutoCreateRowSorter(true);
			this.add(new JScrollPane(table));
			
			this.pack();
			this.setLocationRelativeTo(Neiox.this);
			this.setModal(true);
		}
		
	}
	
}