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Here, the first argument is the name of the property, and the second argument is the class of the Bean
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// A Bean information class import javabeans*; public class ColorsBeanInfo extends SimpleBeanInfo { public PropertyDescriptor[] getPropertyDescriptors() { try { PropertyDescriptor rectangular = new PropertyDescriptor("rectangular", Colorsclass); PropertyDescriptor pd[] = {rectangular}; return pd; } catch(Exception e) { Systemoutprintln("Exception caught " + e); } return null; } }
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The final class is called IntrospectorDemo It uses introspection to display the properties and events that are available within the Colors Bean
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// Show properties and events import javaawt*; import javabeans*; public class IntrospectorDemo { public static void main(String args[]) { try { Class c = ClassforName("Colors"); BeanInfo beanInfo = IntrospectorgetBeanInfo(c); Systemoutprintln("Properties:"); PropertyDescriptor propertyDescriptor[] = beanInfogetPropertyDescriptors(); for(int i = 0; i < propertyDescriptorlength; i++) { Systemoutprintln("\t" + propertyDescriptor[i]getName()); } Systemoutprintln("Events:"); EventSetDescriptor eventSetDescriptor[] = beanInfogetEventSetDescriptors(); for(int i = 0; i < eventSetDescriptorlength; i++) { Systemoutprintln("\t" + eventSetDescriptor[i]getName()); } } catch(Exception e) { Systemoutprintln("Exception caught " + e); } } }
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The output from this program is the following: Properties: rectangular Events: mouseWheel mouse mouseMotion component hierarchyBounds focus hierarchy propertyChange inputMethod key Notice two things in the output First, because ColorsBeanInfo overrides getPropertyDescriptors( ) such that the only property returned is rectangular, only the rectangular property is displayed However, because getEventSetDescriptors( ) is not overridden by ColorsBeanInfo, design-pattern introspection is used, and all events are found, including those in Colors superclass, Canvas Remember, if you don t override one of the get methods defined by SimpleBeanInfo, then the default, design-pattern introspection is used To observe the difference that ColorsBeanInfo makes, erase its class file and then run IntrospectorDemo again This time it will report more properties
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n Part II, you saw how to build user interfaces with the AWT classes Although the AWT is still a crucial part of Java, its component set is no longer widely used to create graphic user interfaces Today, most programmers use Swing for this purpose Swing is a set of classes that provides more powerful and flexible GUI components than does the AWT Simply put, Swing provides the look and feel of the modern Java GUI Coverage of Swing is divided between two chapters This chapter introduces Swing It begins by describing Swing s core concepts It then shows the general form of a Swing program, including both applications and applets It concludes by explaining how painting is accomplished in Swing The following chapter presents several commonly used Swing components It is important to understand that the number of classes and interfaces in the Swing packages is quite large, and they can t all be covered in this book (In fact, full coverage of Swing requires an entire book of its own) However, these two chapters will give you a basic understanding of this important topic
NOTE For a comprehensive introduction to Swing, see my book Swing: A Beginner s Guide
published by McGraw-Hill/Osborne (2007)
The Origins of Swing
Swing did not exist in the early days of Java Rather, it was a response to deficiencies present in Java s original GUI subsystem: the Abstract Window Toolkit The AWT defines a basic set of controls, windows, and dialog boxes that support a usable, but limited graphical interface One reason for the limited nature of the AWT is that it translates its various visual components into their corresponding, platform-specific equivalents, or peers This means that the look and feel of a component is defined by the platform, not by Java Because the AWT components use native code resources, they are referred to as heavyweight The use of native peers led to several problems First, because of variations between operating systems, a component might look, or even act, differently on different platforms This potential variability threatened the overarching philosophy of Java: write once, run anywhere Second, the look and feel of each component was fixed (because it is defined by the platform) and could not be (easily) changed Third, the use of heavyweight components caused some frustrating restrictions For example, a heavyweight component is always rectangular and opaque
Part III:
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