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POJava GUI class buttonPanel
 

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    <p>I want a Panel of 12 buttons to show up in my GUI. But for some reason they are not showing up. I don't know what is wrong with my code right now. I haven't put anything in my action performed method yet, but I will (right now I am just focused on getting the buttons to show). So could someone tell me what's wrong? Thanks! </p> <p>Edit* This is all that is in my GUI Class, I want two canvases of elevator objects to show (nothing is showing)</p> <pre><code>import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.util.ArrayList; public class GUI extends JFrame implements ActionListener { private static final Dimension PREF_SIZE = new Dimension(1000, 1000); MyCanvas leftCanvas = new MyCanvas(); MyCanvas rightCanvas = new MyCanvas(); ArrayList&lt;JButton&gt; buttonList = new ArrayList&lt;JButton&gt;(); JPanel buttonPanel, leftPanel, rightPanel; public GUI() { super("Elevators"); //setSize(800,800); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //setVisible(true); JPanel mainPanel = new JPanel(); mainPanel.setLayout(new GridLayout(1,3)); leftPanel = new JPanel(); leftPanel.add(leftCanvas); rightPanel = new JPanel(); rightPanel.add(rightCanvas); buttonPanel = new JPanel(); buttonPanel.setLayout(new GridLayout(12,1)); buttonPanel.setSize(900,900); add(mainPanel); for(int i=0; i&lt;12; i++) { buttonList.add(new JButton(""+i)); JButton btn = buttonList.get(i); buttonPanel.add(btn); } mainPanel.add(buttonPanel, BorderLayout.CENTER); mainPanel.add(leftPanel, BorderLayout.EAST); mainPanel.add(rightPanel, BorderLayout.WEST); createAndShowGui(); } @Override public Dimension getPreferredSize() { return PREF_SIZE; } private static void createAndShowGui() { UI frame = new UI(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.pack(); frame.setLocationByPlatform(true); frame.setVisible(true); } //public static void main(String[] args) { //SwingUtilities.invokeLater(new Runnable() { // public void run() { // createAndShowGui(); // } //}); //} //public void paint(Graphics g) //{ // } public void actionPerformed(ActionEvent e) { } } </code></pre> <p>Here is my Canvas class </p> <pre><code>import java.awt.*; import java.awt.event.*; import javax.swing.JFrame; import javax.swing.JButton; public class MyCanvas extends Canvas { private Elevator e; int xPos =0; int yPos=0; public MyCanvas() { setSize(600,600); repaint(); } public void paint(Graphics g) { g.setColor(Color.BLACK); g.fillRect(xPos,yPos,100, 100); } public void actionPerformed(ActionEvent e) { repaint(); } public void setElevator(Elevator ev) { e = ev; } } </code></pre> <p><img src="https://i.stack.imgur.com/XWC1K.jpg" alt="This is what I am trying to accomplish w/ the project"></p>
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    1. CONo buttons are showing up at all? Is the buttonPanel showing up? Have you tried putting a border around it?
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    2. COThis won't answer your question, but you shouldn't use BorderLayout constraints when adding to a GridLayout-using container (mainPanel). i.e., `mainPanel.add(buttonPanel, BorderLayout.CENTER);` makes no sense. For better help, consider creating and posting an [sscce](http:sscce.org).
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    3. COhaven't tried putting a border around it, but even w/o a border then panel and the buttons should show right?
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