numbers

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

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;
import javax.swing.JTextArea;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JScrollPane;


public class Numbers extends JFrame {

	private JPanel contentPane;

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

	/**
	 * Create the frame.
	 */
	public Numbers() {
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 450, 300);
		contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);
		contentPane.setLayout(null);
		
		JLabel lblNumbersFrom = new JLabel("Numbers from 1 - 20");
		lblNumbersFrom.setBounds(23, 21, 118, 50);
		contentPane.add(lblNumbersFrom);
		
		JScrollPane scrollPane = new JScrollPane();
		scrollPane.setBounds(59, 55, 241, 149);
		contentPane.add(scrollPane);
		
		final JTextArea output = new JTextArea();
		scrollPane.setViewportView(output);
		
		JButton btnCopute = new JButton("Copute");
		btnCopute.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				int n;
				for(n=1;n<=20;n++){
					output.append(n+"\n");
				}
			}
		});
		btnCopute.setBounds(47, 228, 89, 23);
		contentPane.add(btnCopute);
	}
}