import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
//Nothing special here, just importing the stuff we need.
public class phoneDialer {
    void PhoneDialer() { //We create the GUI in the constructor.
        JFrame Dialer = new JFrame();
        Dialer.setSize(200, 250); //Size of the window should be 200 by 250 pixels
        Dialer.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //This should cause the program to exit when you press the "X" in the corner of the window.
        JPanel mainPanel = new JPanel();
        mainPanel.setLayout(new BoxLayout(mainPanel, BoxLayout.Y_AXIS)); //Creating a new JPanel and assigning it a vertical layout
        Border newBorder = BorderFactory.createEmptyBorder(10, 10, 10, 10); //Creating a new border for use in between buttons
        mainPanel.setBorder(newBorder); //Setting newPanel to use newBorder
        JPanel topLabel = new JPanel(new FlowLayout());
        topLabel.add(new JLabel("Enter the number to dial:")); //Making a new Panel and giving it a label
        JPanel gridPanel = new JPanel(new GridLayout(4, 3, 5, 5)); //Creating a new JPanel for the buttons, and giving it a grid layout
        Border gridBorder = BorderFactory.createEmptyBorder(5, 5, 5, 5);
        gridPanel.setBorder(gridBorder); //Creating and setting the border for gridPanel
        gridPanel.add(new JButton("1"));
        gridPanel.add(new JButton("2"));
        gridPanel.add(new JButton("3"));
        gridPanel.add(new JButton("4"));
        gridPanel.add(new JButton("5"));
        gridPanel.add(new JButton("6"));
        gridPanel.add(new JButton("7"));
        gridPanel.add(new JButton("8"));
        gridPanel.add(new JButton("9"));
        gridPanel.add(new JButton("-"));
        gridPanel.add(new JButton("0"));
        mainPanel.add(topLabel, gridPanel);
        mainPanel.add(new JButton("Dial Number"), Component.CENTER_ALIGNMENT);
        mainPanel.setVisible(true);
    }
}
    public static void main(String[] args) {

}