import java.awt.BorderLayout;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JTextField;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;

public class Zadacha2 extends JFrame {

	private JPanel contentPane;
	private JTextField textField;

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					Zadacha2 frame = new Zadacha2();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	/**
	 * Create the frame.
	 */
	public Zadacha2() {
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 450, 118);
		contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);
		contentPane.setLayout(null);

		JLabel lblNewLabel = new JLabel("");
		lblNewLabel.setBounds(10, 42, 46, 14);
		contentPane.add(lblNewLabel);

		textField = new JTextField();
		textField.addKeyListener(new KeyAdapter() {
			@Override
			public void keyTyped(KeyEvent e) {
				if(e.getKeyChar() == '1' && textField.getText().endsWith(",")) {
					String[] num = textField.getText().split(",");
					int kratno = 0;
					int broi = 0;
					for(String n : num) {
						int chislo = Integer.valueOf(n);
						if(chislo % 4 == 0) {
							kratno += chislo;
							broi++;
						}
					}

					lblNewLabel.setText(broi == 0 ? "Nqma kratni na 4" : String.valueOf(kratno / broi));
				}
			}
		});
		textField.setBounds(10, 11, 414, 20);
		contentPane.add(textField);
		textField.setColumns(10);

		JButton btnNewButton = new JButton("Calc");
		btnNewButton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				int kratno = 0;
				int broi = 0;
				while(true) {
					int chislo = Integer.parseInt(JOptionPane.showInputDialog("Vuvedete chislo"));
					if(chislo == 1) break;
					if(chislo % 4 == 0) {
						kratno += chislo;
						broi++;
					}
				}

				lblNewLabel.setText(broi == 0 ? "Nqma kratni na 4" : String.valueOf(kratno / broi));
			}
		});
		btnNewButton.setBounds(335, 45, 89, 23);
		contentPane.add(btnNewButton);
	}
}