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I'm working on a program in which I am using the BorderLayout Manager. However, I'm having a difficult time changing the size of the window. I want to make it longer and more narrow, with only one or two text fields per row and want to make the text field where there user enters in their information shorter to only allow for up to a 3 digit number.

Here is my code:

[
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.text.DecimalFormat;

public class CustomerVisit extends JFrame
{	// Begin public class

	private DataPanel dataPanel;		// A panel to hold labels and text fields
	private JPanel buttonPanel;			// A panel for the buttons
	private JButton calcButton;			// Button to calculate everything
	private JButton resetButton;		// Button to reset everything

	private final int WINDOW_WIDTH = 400;	// Setting the window width
	private final int WINDOW_HEIGHT = 350;	// Setting the window height


	// Create the constructor

	public CustomerVisit()
	{	// Begin public CustomerVisit()

		// Display the title
		setTitle("Customer Visit");

		// Set the size of the window
		setSize(WINDOW_WIDTH, WINDOW_HEIGHT);

		// Specify what happens when the close button is clicked
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		// Create a DataPanel object
		dataPanel = new DataPanel();

		// Build the panel that contains the buttons
		buildButtonPanel();

		// Add a BorderLayout manager to the content pane
		setLayout(new BorderLayout());

		// Add the panel to the content pane
		add(dataPanel, BorderLayout.CENTER);
		add(buttonPanel, BorderLayout.SOUTH);

		// Pack and display the window
		pack();
		setVisible(true);

	}	// End public CustomerVisit()

	// The buildButtonPanel method creates a panel containing buttons

	private void buildButtonPanel()
	{	// Begin private void buildButtonPanel()

		// Create a button to Calculate the expenses
		calcButton = new JButton("Calculate Charges");

		// Add an action listener to the button
		calcButton.addActionListener(new CalcButtonListener());

		// Create a button to reset everything
		resetButton = new JButton("Reset");

		// Add an action listener to the button
		resetButton.addActionListener(new ResetButtonListener());

		// Put the buttons in their own panel
		buttonPanel = new JPanel();
		buttonPanel.add(resetButton);
		buttonPanel.add(calcButton);

	}	// End private void buildButtonPanel()

	// CalcButtonListener is an action listener class for calcButton component

	private class CalcButtonListener implements ActionListener
	{	// Begin private class CalcButtonListener implements ActionListener

		/**
			actionPerformed method
			@param e An ActionEvent object
		*/

		public void actionPerformed(ActionEvent e)
		{	// Begin public void actionPerformed(ActionEvent e)

			double OIL_CHANGE   =  26.00;	// Constant for oil change- $26.00
			double LUBE_JOB	    =  18.00;	// Constant for lube job- $18.00
			double RAD_FLUSH    =  30.00;	// Constant for radiator flush- $30.00
			double TRANS_FLUSH  =  80.00;	// Constant for transmission flush- $80.00
			double INSPECTION   =  15.00;	// Constant for inspection- $15.00
			double MUFFLER_REPL = 100.00;	// Constant for muffler replacement- $100.00
			double TIRE_ROTATE  =  20.00;	// Constant for tire rotation- $20.00
			double HOURLY_RATE  =  20.00;	// Constant for nonroutine service hourly rate- $20.00
			double miscParts;				// Variable for nonroutine parts
			double totalMiscParts;			// Variable for total cost of misc parts
			double totalOilChange;			// Variable for total cost of oil changes
			double totalLubeJob;			// Variable for total cost of lube jobs
			double totalRadFlush;			// Variable for total cost of radiator flushes
			double totalTransFlush;			// Variable for total cost of transmission flushes
			double totalInspection;			// Variable for total cost of inspections
			double totalMufflerRepl;		// Variable for total cost of muffler replacements
			double totalTireRotate;			// Variable for total cost of tire rotations
			double totalHourlyRate;			// Variable for total cost of hourly rate
			double totalNonroutine;			// Variable for total cost of nonroutine services provided
			double totalCost;				// Variable for total cost of services
			String msg;						// To hold a message

			// Create a DecimalFormat object to format output
			DecimalFormat dollar = new DecimalFormat("#,###.##");

			// Calculate the cost of oil changes
			totalOilChange = OIL_CHANGE * dataPanel.getOilChangeQuantity();

			// Calculate the cost of lube jobs
			totalLubeJob = LUBE_JOB * dataPanel.getLubeJobQuantity();

			// Calculate the cost of radiator flushes
			totalRadFlush  = RAD_FLUSH * dataPanel.getRadFlushQuantity();

			// Calculate the cost of transmission flushes
			totalTransFlush = TRANS_FLUSH * dataPanel.getTransFlushQuantity();

			// Calcluate the cost of inspections
			totalInspection = INSPECTION * dataPanel.getInspectionQuantity();

			// Calculate the cost of muffler replacements
			totalMufflerRepl = MUFFLER_REPL * dataPanel.getMufflerReplQuantity();

			// Calcluate the cost of tire rotations
			totalTireRotate = TIRE_ROTATE * dataPanel.getTireRotateQuantity();

			// Calculate the non-routine services performed
			totalHourlyRate = HOURLY_RATE * dataPanel.getHourlyRateQuantity();
			totalMiscParts = dataPanel.getMiscPartsCost() * dataPanel.getMiscPartsQuantity();
			totalNonroutine = totalHourlyRate + totalMiscParts;

			// Calculate the total cost of the visit
			totalCost = totalOilChange + totalLubeJob + totalRadFlush + totalTransFlush + totalInspection + totalMufflerRepl + totalTireRotate + totalNonroutine;

			// Create the message to display
			msg = "Total cost of customer visit: $" +
				dollar.format(totalCost);

			// Display the message
			JOptionPane.showMessageDialog(null, msg);

		}	// End public void actionPerformed(ActionEvent e)

	}	// End private class CalcButtonListener implements ActionListener

	// ResetButtonListener is an action listener class for the resetButton component

	private class ResetButtonListener implements ActionListener
	{	// Begin private class ResetButtonListener implements ActionListener

		/**
			actionPerformed method
			@param e An ActionEvent object
		*/

		public void actionPerformed(ActionEvent e)
		{	// Begin public void actionPerformed(ActionEvent e)

			dataPanel.reset();

		}	// End public void actionPerformed(ActionEvent e)

	}	// End private class ResetButtonListener implements ActionListener

	/**
		The main method creates in instance of the Customer Visit class,
		causing it to display its window.
	*/

	public static void main(String[] args)
	{	// Begin public static void main(String[] args)

		CustomerVisit cv = new CustomerVisit();
	}	// End public static void main(String[] args)

}	// End public class CustomerVisit extend JFrame

]

Edited by Nick Evan: added code tags

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