// COBOL Programmers Swing With Java - copyright 2005 Doke, Hardgrave, & Johnson
// Chapter 10 - Graphical User Interfaces
// Program to demonstrate GUI w/ labels
// CustomerGUITwo.java 1 JAN 05

import javax.swing.*; // import Swing package

import java.awt.*; // import AWT package

public class CustomerGUITwo extends JFrame  // this class inherits methods from the JFrame class
{
    // static variables to hold frame dimensions in pixels
    private static final int WIDTH = 275;
    private static final int HEIGHT = 170;

    private JLabel nameLabel, ssnLabel, addressLabel, phoneLabel;

    public CustomerGUITwo() // constructor method defines frame
    {
            setTitle("New Customer"); // set the title of the frame

            // instantiate JLabel objects
            nameLabel = new JLabel("Name:");
            ssnLabel = new JLabel("SS No.:");
            addressLabel = new JLabel("Address:");
            phoneLabel = new JLabel("Phone No.:");

            Container pane = getContentPane(); // get a content pane for the frame

            GridLayout aGrid = new GridLayout(4, 1); // create a four row, one column layout

            pane.setLayout(aGrid); // set the layout for the pane

            // add label objects to the pane
            pane.add(nameLabel);
            pane.add(ssnLabel);
            pane.add(addressLabel);
            pane.add(phoneLabel);

            setSize(WIDTH, HEIGHT);   // set the frame size

            centerFrameOnScreen(WIDTH, HEIGHT); // call method to center frame on screen
    } // end constructor method

    public void centerFrameOnScreen(int frameWidth, int frameHeight) // method declaration
    {
            // use the Toolkit and Dimension classes of the java.awt package

            // create a Toolkit object
            Toolkit aToolkit = Toolkit.getDefaultToolkit();

            // create a Dimension object with user screen information
            Dimension screen = aToolkit.getScreenSize();

            // assign x, y position of upper-left corner of frame
            int xPostionOfFrame = (screen.width - frameWidth)/2;
            int yPositionOfFrame = (screen.height - frameHeight)/2;

            // method to center frame on user's screen
            setBounds(xPostionOfFrame, yPositionOfFrame, frameWidth, frameHeight);

    } // end centerFrameOnScreen() method

    public static void main(String [] args)  // declare main() method
    {
            JFrame aCustomerGUITwo = new CustomerGUITwo();  // create the frame object
            aCustomerGUITwo.show();  // display the frame

    } // end main

} // end class