No Components are showing up on JFrame GUI

Question

I'm fairly new to Swing and GUIs, and so far, only the window will appear, but none of the components will be visible. What can I do about this? Is there something wrong with the visibility or is it with a container?

   import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class PhoneCaller 
{
  JButton button1;
  JButton button2;
  JButton button3;
  JButton button4;
  JButton button5;
  JButton button6;
  JButton button7;
  JButton button8;
  JButton button9;
  JButton buttonDash;
  JButton button0;
  JButton dialButton;

  String phoneNum = "";

  public static void main (String[] args)
   {
    new PhoneCaller();
    }

  public PhoneCaller()
  {
    JFrame myFrame = new JFrame();
    myFrame.setTitle("Dialer");
    myFrame.setSize(200, 250);
    myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);


    JPanel myPanel = new JPanel(new BorderLayout(10,10));
    myPanel.setLayout(new BoxLayout(myPanel, BoxLayout.Y_AXIS));
    myFrame.add(myPanel);


    JPanel myPanel2 = new JPanel();
    myPanel2.setLayout(new FlowLayout());
    JLabel lab = new JLabel("Enter the number to dial");
    myPanel2.add(lab);

    JPanel myPanel3 = new JPanel();
    myPanel3.setLayout(new GridLayout(4,3,5,5));
    button1 = new JButton ("1");
    myPanel3.add(button1);
    button2 = new JButton ("2");
    myPanel3.add(button2);
    button3 = new JButton ("3");
    myPanel3.add(button3);
    button4 = new JButton ("4");
    button5 = new JButton ("5");
    button6 = new JButton ("6");
    button7 = new JButton ("7");
    button8 = new JButton ("8");
    button9 = new JButton ("9");
    button0 = new JButton ("0");
    buttonDash = new JButton ("-");

    myPanel3.add(button4);
    myPanel3.add(button5);
    myPanel3.add(button6);
    myPanel3.add(button7);
    myPanel3.add(button8);
    myPanel3.add(button9);
    myPanel3.add(button0);
    myPanel3.add(buttonDash);

    myFrame.setVisible(true);
  }
}

Answer 1

I think you forgot to add myPanel2 and myPanel3 inside myPanel .

myPanel.add(myPanel2);
myPanel.add(myPanel3);

Answer 2

You forgot to add myPanel2 and myPanel3 to your JFrame, add the following snippet to the end of your code

myFrame.add(myPanel2);
myFrame.add(myPanel3);