How do I use JList inside of JPanel So I can set the bounds of the list?

Question

I am having trouble using JLists in Java. I have watched video tutorials on how to use them, but they all use them with some sort of layout. I would like to have it so the "setPreferedLayout" is null, and I can use the setBounds method to decide where my lists and buttons go on the window. When I do that, and I do somthing like frame.add(list) or panel.(list) to add it to my panel, it doesn't show up on the window, but my button does.

I have something like this:

    //DECLARATION
    JFrame f = new JFrame("main Window");
    JPanel p = new JPanel();

    int WIDTH = 800;
    int HEIGHT = 650;

    public static JList mainList;
    String[] mainArray = {"one","two","three"};

    //INIT
    public mainClass() {
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(p);
        f.setVisible(true);
        p.setLayout(null);
        p.setPreferredSize( new Dimension(WIDTH,HEIGHT) );
        f.pack();
        p.setVisible(true);

        p.setFocusable(true);

        System.setProperty("sun.java2d.opengl","true");
        Thread thr1 = new Thread (r1);
        thr1.start();

        mainList = new JList(mainArray);
        mainList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        mainList.setSelectedIndex(0);
        mainList.setVisibleRowCount(3);
        JScrollPane listScrollPane = new JScrollPane(mainList);
    }

again, i'm trying to create a JList that I can have in whatever position I would like. thats basically what i'm trying to get. Whenever I try to di it the way it works will Jbuttons (setting its bounds and adding it to the panel) It doesn't show up when I runt he program...

Answer 1

public mainClass() {
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        mainList = new JList(mainArray);
        mainList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        mainList.setSelectedIndex(0);
        mainList.setVisibleRowCount(3);
        JScrollPane listScrollPane = new JScrollPane(mainList);
        p.add(listScrollPane);
        f.add(p);
        p.setPreferredSize( new Dimension(WIDTH,HEIGHT) );        
        f.pack();        
        f.setVisible(true);
        p.setFocusable(true);

        System.setProperty("sun.java2d.opengl","true");
        Thread thr1 = new Thread (r1);
        thr1.start();


    }

this should work you never added your list to panel, also you set visible than pack() thats not gonna work. The last thing you should do is set Visible.