public class Application extends JFrame {
	private static final long serialVersionUID = 1L;

	private static final String TITLE = "Average Machine";

	private static final int WIDTH = 320;
	private static final int HEIGHT = 125;

	private JPanel panel;
	private JTextField field, infoField;
	private JButton btnAdd, btnClear, btnAvg;
	private JLabel label;

	private int counter;
	private int index = 0;
	private double total = 0;
	private double ans = 0;

	public double temps[] = new double[10000];

	public Application() {
		initComponents();
		initLayout();
	}

	private void initComponents() {
		//Fonts
		Font font0 = new Font("Arial", Font.PLAIN, 11);
		Font font1 = new Font("Arial", Font.PLAIN, 9);

		panel = new JPanel();

		// JButtons
		btnAdd = new JButton("Add");
		btnAdd.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				onClick();
			}
		});

		btnAvg = new JButton("Average");
		btnAvg.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				average();
			}
		});

		btnClear = new JButton("Clear");
		btnClear.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				clear();
			}
		});

		btnAdd.setFont(font0);
		btnAvg.setFont(font0);
		btnClear.setFont(font0);

		//Text Field
		field = new JTextField();
		field.setHorizontalAlignment(SwingConstants.CENTER);
		field.setColumns(38);
		field.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				onClick();
			}
		});

		//Info field
		infoField = new JTextField();
		infoField.setEditable(false);
		infoField.setText("Start completed");
		infoField.setHorizontalAlignment(SwingConstants.CENTER);
		infoField.setColumns(38);

		// Label
		label = new JLabel("All Rights Reserverd - v0.00");
		label.setFont(font1);

		// Adding panel
		add(panel, BorderLayout.CENTER);
	}

	private void onClick() {
		try {
			temps[index] = Double.parseDouble(field.getText());
			counter++;
			total += temps[index];
			infoField.setText(temps[index] + " added. " + "Amount: " + counter + ". Total: " + total);
			System.out.println("Total: " + total);
			System.out.println("Added: " + temps[index]);
			System.out.println("Counter: " + counter);
			System.out.println("Temp[" + index + "]: " + temps[index]);
			System.out.println("Index: " + index + "\n");
			field.setText("");
			field.requestFocusInWindow();
		} catch (NumberFormatException e) {
			infoField.setText("Error: Wrong character format");
			return;
		}
		index++;
	}

	private void clear() {
		field.setText("");
		infoField.setText("Clear completed");
		counter = 0;
		total = 0;
		index = 0;
		System.out.println("Counter: " + counter);
		System.out.println("Index: " + index);
		System.out.println("Total: " + total + "\n");
	}

	private void average() {
		double ans = total / index;
		infoField.setText("Average: " + ans + " | " + total + " / " + index + "");
		counter = 0;
		total = 0;
		index = 0;
		System.out.println("Counter: " + counter);
		System.out.println("Index: " + index);
		System.out.println("Total: " + total + "\n");
	}

	private void initLayout() {
		//Adding all the components to the panel
		panel.add(infoField);
		panel.add(field);
		panel.add(btnAdd);
		panel.add(btnAvg);
		panel.add(btnClear);
		panel.add(label);

		//setting the rules of the JFrame
		setTitle(Application.TITLE);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setResizable(false);
		setSize(WIDTH, HEIGHT);
		setLocationRelativeTo(null);
		setVisible(true);
		field.requestFocusInWindow();
	}

	public static void main(String[] args) {
		try {
			UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
			new Application();
		} catch (Exception e) {
			e.printStackTrace();
		}

	}
}