Java Swing How to - Show scrollbar for JList within a small frame

Question

We would like to know how to show scrollbar for JList within a small frame.

Answer

import java.awt.BorderLayout;
//from   w  w  w  .  j av a  2  s. c  o m
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;

public class Main {
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    JPanel panel = new JPanel();
    JScrollPane listScrollPane = new JScrollPane();
    String[] stringArray = { "Testing", "This", "Stuff" };
    JList<String> rowList = new JList<>(stringArray);

    rowList.setVisibleRowCount(2);
    listScrollPane.setViewportView(rowList);
    panel.setLayout(new BorderLayout());
    panel.add(listScrollPane);
    frame.add(panel);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    frame.pack();
    frame.setVisible(true);

  }
}