Code:
import javax.swing.JApplet;
import java.awt.BorderLayout;
import javax.swing.JSlider;

import java.awt.*;
import java.applet.*;

public class SliderTest extends JApplet {
    public void init() {
        createGUI();
    }

    private void createGUI() {
        JSlider slider = new JSlider(JSlider.VERTICAL, 0, 100, 50);
...