import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;

public class SwingTest {
    private JButton button;

    public SwingTest() {
        JFrame frame = new JFrame("SwingTest");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setBounds(100, 100, 200, 100);
	
        button = new JButton("処理できます");
        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                button.setText("処理中");
                doHeavyProcess();
                button.setText("処理できます");
            }
        });

        frame.getContentPane().add(button);
        frame.setVisible(true);
    }

    private void doHeavyProcess() {
        try {
            Thread.sleep(10000L);
        } catch (InterruptedException ex) {}
    }

    public static void main(String[] args) {
        new SwingTest();
    }
}