Evil JScrollBars

How do you add a scroll thing to a JOptionPane?

Code :

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import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
 
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 
import java.util.*;
import java.io.*;
 
import java.awt.event.WindowEvent;
import java.awt.Window;
import javax.swing.JScrollPane;
import java.awt.Component;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JScrollBar;
import javax.swing.JComboBox;
import javax.swing.JInternalFrame;
import javax.swing.JDesktopPane;
import java.awt.Color;
 
public class OpenANewWindow {
	public static void main(String[] args) {
		MainWindow frame = new MainWindow();
		frame.showGUI();
	}
}
 
class MainWindow extends JFrame {
	JButton button;
	JPanel panel;
	NewWindow newWindow = new NewWindow();
 
	public MainWindow() {
		panel = new JPanel();
		newWindow = new NewWindow();
		button = new JButton("New Window");
 
		button.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				newWindow.setVisible(true);
			}
		});
 
		panel.add(button);
 
		getContentPane().add(panel);
	}
 
	public void showGUI() {
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setSize(300,300);
		setLocation(100,100);
		setVisible(true);
	}
}
 
class NewWindow extends JFrame {
JScrollbar bar, bar2;
JPanel panel2;
	public NewWindow() {
panel2 = new JPanel();
bar = new JScrollBar(JScrollBar.VERTICAL, 30, 20, 0, 200);
bar.setBlockIncrement(1);
		bar.setUnitIncrement(2);
bar.setVisible(true);
bar2 = new JScrollBar(JScrollBar.HORIZONTAL, 30, 40, 0, 200);
		bar2.setBlockIncrement(1);
		bar2.setUnitIncrement(2);
                bar2.setVisible(true);
panel2.add(bar);
panel2.add(bar2);
 
 
}
public void showGUI2()
{
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setSize(200,200);
		setLocation(300,300);
		setVisible(false);
	}
}

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I updated it on the other thread. It now shows a much smaller program like you wanted.