JPanel with Grid Layout and JButtons doesn't load / work

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I'm having trouble getting a JPanel inside a BorderLayout to work. I defined the layout of the Panel as a Grid Layout, and then added a bunch of buttons I had made before hand to the JPanel. However, when I run the program, the JFrame loads but nothing within the frame loads. Here's the code:

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

public class Phone extends JFrame {
private JTextField PhoneText;
private JPanel ButtonPanel;
private JButton bttn1;
private JButton bttn2;
private JButton bttn3;
private JButton bttn4;
private JButton bttn5;
private JButton bttn6;
private JButton bttn7;
private JButton bttn8;
private JButton bttn9;
private JButton bttn10;
private JButton bttn11;
private JButton bttn12;

public Phone(){
    setTitle("Phone - Agustin Ferreira");
    Container ContentPane = getContentPane();
    ContentPane.setLayout(new BorderLayout());
    setSize(300, 400);
    setVisible(true);
    setBackground(Color.DARK_GRAY);
    PhoneText = new JTextField("(317)188-8566");
    bttn1 = new JButton ("1");
    bttn2 = new JButton ("2");
    bttn3 = new JButton ("3");
    bttn4 = new JButton ("4");
    bttn5 = new JButton ("5");
    bttn6 = new JButton ("6");
    bttn7 = new JButton ("7");
    bttn8 = new JButton ("8");
    bttn9 = new JButton ("9");
    bttn10 = new JButton ("*");
    bttn11 = new JButton ("0");
    bttn12 = new JButton ("#");
    ButtonPanel = new JPanel(new GridLayout(4,3,0,0));

    ButtonPanel.add(bttn1);
    ButtonPanel.add(bttn2);
    ButtonPanel.add(bttn3);
    ButtonPanel.add(bttn4);
    ButtonPanel.add(bttn5);
    ButtonPanel.add(bttn6);
    ButtonPanel.add(bttn7);
    ButtonPanel.add(bttn8);
    ButtonPanel.add(bttn9);
    ButtonPanel.add(bttn10);
    ButtonPanel.add(bttn11);
    ButtonPanel.add(bttn12);
    ContentPane.add(PhoneText, BorderLayout.NORTH);
    ContentPane.add(ButtonPanel, BorderLayout.CENTER);
}

}

Additionally, I have another class that calls the Phone class. Here's the code for that, just in case:

package ProgrammingAssignment11;

import javax.swing.JFrame;

public class GUI_Driver {

public static void main(String[] args) {
    Phone Nokia;
    Nokia = new Phone();
    Nokia.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
}

}

Any Help?

Much appreciated, M3tal T1ger

asked 22 secs ago

user3534236

1