das

import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JMenuBar;
import javax.swing.JTextField;
import javax.swing.JTextPane;
import java.awt.Button;

public class Main {

    private JFrame frame;
    private JTextField textField;
    private JTextField textField_1;
    private JTextField textField_2;
    private JTextField textField_3;
    private JTextField textField_4;

    public int a = 1;
    public int b = 3;
    public int c = 2;


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

    /**
     * Create the application.
     */
    public Main() {
        initialize();
    }

    /**
     * Initialize the contents of the frame.
     */
    private void initialize() {

        frame = new JFrame();
        frame.setBounds(100, 100, 260, 291);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().setLayout(null);

        JTextPane txtpnA = new JTextPane();
        txtpnA.setText("A = ");
        txtpnA.setBounds(10, 11, 33, 20);
        frame.getContentPane().add(txtpnA);

        JTextPane txtpnB = new JTextPane();
        txtpnB.setText("B = ");
        txtpnB.setBounds(92, 11, 26, 20);
        frame.getContentPane().add(txtpnB);

        JTextPane txtpnC = new JTextPane();
        txtpnC.setText("C = ");
        txtpnC.setBounds(165, 11, 33, 20);
        frame.getContentPane().add(txtpnC);

        JTextPane txtpnAxbxc = new JTextPane();
        txtpnAxbxc.setText("Ax2+Bx+C=0");
        txtpnAxbxc.setBounds(44, 42, 74, 20);
        frame.getContentPane().add(txtpnAxbxc);

        JTextPane txtpnX = new JTextPane();
        txtpnX.setText("X1 =");
        txtpnX.setBounds(10, 90, 33, 20);
        frame.getContentPane().add(txtpnX);

        JTextPane txtpnX_1 = new JTextPane();
        txtpnX_1.setText("X2 =");
        txtpnX_1.setBounds(99, 90, 33, 20);
        frame.getContentPane().add(txtpnX_1);

        textField = new JTextField ();
        textField.setBounds(44, 90, 45, 20);
        frame.getContentPane().add(textField);
        textField.setColumns(10);

        textField_1 = new JTextField();
        textField_1.setBounds(132, 90, 45, 20);
        frame.getContentPane().add(textField_1);
        textField_1.setColumns(10);

        textField_2 = new JTextField("a");
        textField_2.setBounds(43, 11, 33, 20);
        frame.getContentPane().add(textField_2);
        textField_2.setColumns(10);

        textField_3 = new JTextField("b");
        textField_3.setBounds(122, 11, 33, 20);
        frame.getContentPane().add(textField_3);
        textField_3.setColumns(10);

        textField_4 = new JTextField("c");
        textField_4.setBounds(201, 11, 33, 20);
        frame.getContentPane().add(textField_4);
        textField_4.setColumns(10);


        JButton btnNewButton_1 = new JButton("Oblicz");
        btnNewButton_1.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            a = Integer.parseInt(textField_2.getText());
            b = Integer.parseInt(textField_3.getText());
            c = Integer.parseInt(textField_4.getText());

            double delta2 = (b*b)-(4*a*c);
            double delta = Math.sqrt(delta2) ;
            double x1 = (-b+delta)/(2*a);
            double x2 = (-b-delta)/(2*a);

            textField.setText("\n" +x1+ "\n");
            if (a==0) textField.setText("Brak x1");
            if (delta2<0) textField.setText("Brak x1");
            if (delta==0) textField.setText("\n" +-b/(2*a)+ "\n");

            textField_1.setText("\n" +x2+ "\n");
            if (a==0) textField_1.setText("Brak x2");
            if (delta2<0) textField_1.setText("Brak x2");
            if (delta==0) textField_1.setText("Brak x2");
            }
        });
        btnNewButton_1.setBounds(132, 42, 89, 23);
        frame.getContentPane().add(btnNewButton_1);


        JMenuBar menuBar = new JMenuBar();
        frame.setJMenuBar(menuBar);

        Button btnNewButton = new Button("Zapisz");
        btnNewButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
            }
        });
        menuBar.add(btnNewButton);

        Button button = new Button("Zamknij");
        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                System.exit(0);
            }
        });
        menuBar.add(button);
    }
}