invoicer.java

java编程开发技巧与实例的编译测试通过的所有例程

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

public class Invoicer extends JFrame
{
	protected NoEditTableModel data	=	new NoEditTableModel();
	protected JTable table	=	new JTable(data);
	protected JLabel price	=	new JLabel("^^0.0", SwingConstants.RIGHT);
	private class WindowCloser extends WindowAdapter
	{
		public void windowClosing(WindowEvent we)
		{
			System.exit(0);
		}
	}
	public Invoicer()
	{
		super("Simple Table");
		createDataColumns();
		createSampleData();
		JScrollPane scrollTable	=	new JScrollPane(table);
		price.setText("Total Price: $" + total());
		scrollTable.setPreferredSize(new Dimension(400, 100));
		getContentPane().add("Center", new JPanelBox(scrollTable, "Data"));
		getContentPane().add("South", new JPanelBox(price, "Total Cost"));
		
		addWindowListener(new WindowCloser());
		validate();
		pack();
		setLocationRelativeTo(this);
		setVisible(true);
		table.addMouseListener(new InvoicePopup(this));
		table.setToolTipText("right-click for menu");
	}
	private void createDataColumns()
	{
		data.addColumn("ID");
		data.addColumn("Description");
		data.addColumn("Unit Price");
		data.addColumn("Quantity");
		data.addColumn("Price");
	}
	private void createSampleData()
	{
		data.addRow(dataRow(19,		"IBM 770 LAPTOP", 26800, 1));
		data.addRow(dataRow(207,	"External zip drive", 580, 1));
		data.addRow(dataRow(1008,	"sdram memory chips, 128M", 150, 4));
		data.addRow(dataRow(44,		"ibm 21' triniton monitor", 3880, 1));
		data.addRow(dataRow(105,	"external keyboard, black", 480, 1));
		data.addRow(dataRow(207,	"清华同方，滥键盘", 160, 1));
		data.addRow(dataRow(45,		"ibm port replicator", 1200, 1));
	}
	private Object[] dataRow(int id, String desc, double price, int num)
	{
		Object row[]	=	new Object[5];
		row[0]	=	new Integer(id);
		row[1]	=	desc;
		row[2]	=	new Double(price);
		row[3]	=	new Integer(num);
		row[4]	=	new Double(price * num);
		return row;
	}
	protected double total()
	{
		double sum	=	0.0;
		for (int row = 0; row < data.getRowCount(); row ++)
			sum	+=	((Double)data.getValueAt(row, 4)).doubleValue();
		return sum;
	}
	public static void styleCtrl(String style)
	{
		try
		{
			String lf_wind	=	"com.sun.java.swing.plaf.windows.WindowsLookAndFeel";
			String lf_unix	=	"com.sun.java.swing.plaf.motif.MotifLookAndFeel";
			String lf_java	=	"javax.swing.plaf.metal.MetalLookAndFeel";
			if (style.equals("java"))
				UIManager.setLookAndFeel(lf_java);
			else if (style.equals("unix"))
				UIManager.setLookAndFeel(lf_unix);
			else if (style.equals("windows"))
				UIManager.setLookAndFeel(lf_wind);
		}
		catch	(Exception e)
		{
			System.err.println("Exception: " + e);
		}
	}
	public static void main(String args[])
	{
		styleCtrl("java");
		Invoicer st	=	new Invoicer();
	}
}