Adding JScrollPane to a JList problems

Question

Hi,
I am having problem in trying to add a JScrollPane to a JList, it doesnt appear i don't understand what i am doing wrong.
private String [] mainMenu = {"Phonebook", "Messages", "User Options", "Phone Status"};
private JList main = new JList(mainMenu);
private JScrollPane scrolling = new JScrollPane(main);
public Mobile()
         main.setLocation(60, 110);
         main.setSize(90, 50);
         add(scrolling);
         scrolling.setVisible(true);
}

Answer 1

The code to run the app is:
import java.awt.*;
import javax.swing.*;
class MobileGUI {
     public static void main(String[] args) {
          JFrame frame = new JFrame("Mobile Phone Simulation");
          Container pane = frame.getContentPane();
          pane.add(new Mobile());
          frame.setSize(340, 625);
          frame.show();
}The class that contains the components is:
import java.awt.*;
import javax.swing.*;
import javax.swing.text.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.*;
import javax.swing.event.*;
import java.util.*;
import java.io.*;
import java.lang.*;
class Mobile extends JComponent {
private String[] mainMenu = {"Phonebook", "Messages", "User Options", "Phone Status"};
private JList main = new JList(mainMenu);
private JScrollPane scrolling = new JScrollPane(main);
public JTextArea display = new JTextArea(6, 30);
public MobileGUI()
          //Displays
          setLayout(null);
          //Display for messages
          display.setLocation(120, 60);
          display.setSize(90, 50);
          add(display);
          display.setVisible(false);
          //MainMenu Jlist Display
          main.setLocation(120, 60);
          main.setSize(90, 50);
          add(scrolling);
          scrolling.setVisible(true);
     public void paint(Graphics g) {
     g.setColor(Color.gray.brighter());
     g.fillRoundRect(30, 30, 270, 530, 40, 20);
     g.setColor(Color.black);
     g.fillArc(30, 30, 270, 320, 0, 180);
    g.fillArc(30, -180, 270, 740, 180, 180);
     g.setColor(Color.gray);     
     super.paint(g);       
}The JList does not appear neither does the JScrollPane