GCD and lcm[ENG].java

import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import java.awt.Font;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.border.EmptyBorder;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.Color;

public class Lcm extends JFrame {
    private static final long serialVersionUID = 1L;
    private JPanel contentPane;
    private JTextField textField;
    private JTextField textField_1;
    private JLabel lblInserisciSecondoNumero;
    private JLabel lblNewLabel_1;
    private JLabel lblNewLabel_2;
    private JLabel lblNewLabel_3;
    private JLabel lblNewLabel_4;

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

    public Lcm() {
        setTitle("GCD and lcm");
        setForeground(new Color(0, 255, 255));
        setBackground(new Color(0, 0, 0));
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 316, 300);
        contentPane = new JPanel();
        contentPane.setForeground(new Color(0, 255, 255));
        contentPane.setBackground(new Color(0, 0, 0));
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(null);

        lblInserisciSecondoNumero = new JLabel("Insert second number");
        lblInserisciSecondoNumero.setForeground(new Color(0, 255, 255));
        lblInserisciSecondoNumero.setBackground(new Color(0, 0, 0));
        lblInserisciSecondoNumero.setFont(new Font("Tahoma", Font.PLAIN, 17));
        lblInserisciSecondoNumero.setEnabled(false);
        lblInserisciSecondoNumero.setBounds(50, 84, 192, 31);
        contentPane.add(lblInserisciSecondoNumero);

        JLabel lblNewLabel = new JLabel("Insert first number");
        lblNewLabel.setForeground(new Color(0, 255, 255));
        lblNewLabel.setBackground(new Color(0, 0, 0));
        lblNewLabel.setEnabled(false);
        lblNewLabel.setFont(new Font("Tahoma", Font.PLAIN, 17));
        lblNewLabel.setBounds(55, 26, 179, 31);
        contentPane.add(lblNewLabel);

        textField = new JTextField();
        textField.setForeground(new Color(0, 255, 255));
        textField.setBackground(new Color(0, 0, 0));
        textField.setFont(new Font("Tahoma", Font.PLAIN, 20));
        textField.setBounds(42, 25, 200, 31);
        contentPane.add(textField);
        textField.setColumns(10);

        textField_1 = new JTextField();
        textField_1.setForeground(new Color(0, 255, 255));
        textField_1.setBackground(new Color(0, 0, 0));
        textField_1.setFont(new Font("Tahoma", Font.PLAIN, 20));
        textField_1.setColumns(10);
        textField_1.setBounds(42, 83, 200, 31);
        contentPane.add(textField_1);

        JButton btnNewButton = new JButton("Calculate GCD and lcm");
        btnNewButton.setForeground(new Color(0, 255, 255));
        btnNewButton.setBackground(new Color(0, 0, 0));
        btnNewButton.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent arg0) {
                int num = 2;
                int a = Integer.parseInt(textField.getText());
                int b = Integer.parseInt(textField_1.getText());

                while (a % num != 0 | b % num != 0) {
                    num++;
                }
                lblNewLabel_1.setText(Integer.toString(num));
                num = 2;
                while (num % a != 0 | num % b != 0) {
                    num++;
                }
                lblNewLabel_2.setText(Integer.toString(num));
            }
        });
        btnNewButton.setBounds(60, 126, 163, 43);
        contentPane.add(btnNewButton);

        lblNewLabel_1 = new JLabel("");
        lblNewLabel_1.setForeground(new Color(0, 255, 255));
        lblNewLabel_1.setBackground(new Color(0, 0, 0));
        lblNewLabel_1.setFont(new Font("Tahoma", Font.BOLD, 20));
        lblNewLabel_1.setBounds(97, 164, 101, 59);
        contentPane.add(lblNewLabel_1);

        lblNewLabel_2 = new JLabel("");
        lblNewLabel_2.setForeground(new Color(0, 255, 255));
        lblNewLabel_2.setBackground(new Color(0, 0, 0));
        lblNewLabel_2.setFont(new Font("Tahoma", Font.BOLD, 20));
        lblNewLabel_2.setBounds(97, 232, 101, 19);
        contentPane.add(lblNewLabel_2);

        lblNewLabel_3 = new JLabel("GCD");
        lblNewLabel_3.setForeground(new Color(0, 255, 255));
        lblNewLabel_3.setBackground(new Color(0, 0, 0));
        lblNewLabel_3.setFont(new Font("Tahoma", Font.BOLD, 20));
        lblNewLabel_3.setBounds(10, 157, 53, 72);
        contentPane.add(lblNewLabel_3);

        lblNewLabel_4 = new JLabel("lcm");
        lblNewLabel_4.setForeground(new Color(0, 255, 255));
        lblNewLabel_4.setBackground(new Color(0, 0, 0));
        lblNewLabel_4.setFont(new Font("Tahoma", Font.BOLD, 20));
        lblNewLabel_4.setBounds(10, 229, 53, 24);
        contentPane.add(lblNewLabel_4);
    }
}