Browsers Targeted: Internet Explorer 4 and 5 With Internet Explorer 4.0 and above, you can create an arbitrary property on any HTML object. This property, called an expando property, stays
Browsers Targeted: Internet Explorer 3+, Netscape 3 and 4 Sometimes, you need to set up events to happen at periodic intervals. Perhaps the simplest application of this is a clock.
In Java, a readable, writable directory should be empty before an attempt is made to remove it. The following code recursively empties a directory, and its sub-directories, and then removes
With applets, sometimes the browser acts as the applet’s frame. This prevents the user from mistaking the browser window for a separate application and closing it. With this approach, the
Sometimes it is useful to have a text field, for which you can specify a max number of characters. The following class give you just that: import java.awt.*; import java.awt.event.*;
You can easily add a background image to swing’s JTable. The following code shows you how: Note that the image scrolls with the table. public class BackgroundTable { public static
Line separators are dependent on the operating system. This may cause some annoyance when opening files created on another operating system. For example, if you are using Microsoft Windows, and
Cell data in a table may exceed the width of its column. It is a good, user-friendly, idea to have ToolTips appear in a cell showing the entire cell data
In Java you take the remainder with the modulus (%) operator, whereby the sign of the remainder follows the dividend, not the divisor. So (+5 % -2) will be, to