// MyButtonListener.java

import java.awt.event.*;
import java.util.*;
import javax.swing.JOptionPane;

public class MyButtonListener implements ActionListener, Observer
{
	MainWindow window;

	public MyButtonListener(MainWindow window)
	{
		this.window = window;
	}

	public void actionPerformed(ActionEvent ae)
	{
		veryLongProcess();
	}

	public void veryLongProcess()
	{
		LongProcessThread thread = new LongProcessThread();
		thread.addObserver(this);
		new Thread(thread).start();
	}

	// Observer#updateの実装
	public void update(Observable o, Object arg)
	{
		JOptionPane.showMessageDialog(window, "なが〜い処理が終わりました。");
	}
}