Tip Bank

It sometimes makes a lot of sense to throw an exceptionfrom the constructor of a class; look at constructors ofthe java.net.URL for an example. But what do we do if

A call to repaint() will schedule a component to be repainted when the gui thread is free. But what if we can’t wait till then? Well, we can use the

Applets are executed within a web browser, and there’s an easy way to load show a specific URL. 1. Get a reference to the applet context 2. Call the showDocument

Sometimes, it is useful to know which fonts are installed. This can differ from one Java Virtual Machine (JVM) implementation to another. The following code displays the names of all

Sometimes, it is useful to obtain a binary representation of integer, or a character. For example, we might want to represent the character ‘a’ by its binary 01100001, the letter

The java.lang.Math package has useful trigonometric functions such as: public static native double sin(double a) public static native double asin(double a). So, if we write code: double x = 90;

Question: When we call the ShowHelp function in Windows 95, it works with a topic ID but not with a keyword. However, the same source works just the opposite in

A nice touch to a Web page is a button that changes appearance when clicked. All you need is two GIFs and a little JavaScript. The following code initially displays

It is natural to assume that later versions of software will improve performance and fix bugs. However, you may run into the opposite if you try that with an Access