UGM | Ubpa Graphics Mathematics | Graphics library

package me.an.ugm;

import java.awt.EventQueue;

import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.ScrollPaneConstants;
import javax.swing.UIManager;

public class Application
{
    private JFrame frame;

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

        });
    }

    public Application()
    {
        initialize();
    }

    private void initialize()
    {
        frame = new JFrame();
        frame.setTitle("Application");
        frame.setBounds(100, 100, 401, 450);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().setLayout(null);
        //frame.setResizable(false);
        frame.setLocationRelativeTo(null);

        JPanel panel = new JPanel();
        panel.setBounds(0, 0, 296, 710);
        panel.setLayout(null);

        JScrollPane scrollPane = new JScrollPane(panel, ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
        scrollPane.setBounds(0, 0, 296, 399);
        frame.getContentPane().add(scrollPane);

        for (int i = 0, j = 10; i < 20; i++, j += 35)
        {
            JButton button1 = new JButton();
            button1.setBounds(10, j, 25, 25);
            panel.add(button1);

            JComboBox selectorBox = new JComboBox<>();
            selectorBox.setBounds(40, j, 200, 25);
            panel.add(selectorBox);

            JButton button2 = new JButton();
            button2.setBounds(245, j, 25, 25);
            panel.add(button2);
        }
    }
}