package observer.slider;
import javax.swing.JSlider;
import javax.swing.SwingConstants;
public class Main {
	public static void main(String[] args) {
		new M().run();
	}
}

class M implements Runnable {
	static int MIN = 0;
	static int MAX = 100;
	static int INIT = 50;
	int x = INIT;
	public void run () {
		JSlider s = new JSlider(SwingConstants.VERTICAL, M.MIN, M.MAX, M.INIT);
		/* ... */
		s.addChangeListener(e -> {
			JSlider source = (JSlider)e.getSource();
			if (!source.getValueIsAdjusting()) {
				// the next two lines are redundant
				x = source.getValue();
				M.this.x = source.getValue();
			}
		});
	}
}