visual basic 2010 barcode generator Design Patterns for Properties in Java

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Design Patterns for Properties
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A property is a subset of a Bean's state The values assigned to the properties determine the behavior and appearance of that component This section discusses three types of properties: simple, Boolean, and indexed
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Simple Properties
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A simple property has a single value It can be identified by the following design patterns, where N is the name of the property and T is its type public T getN( ); public void setN(T arg); A read/write property has both of these methods to access its values A read-only property has only a get method A write-only property has only a set method The following listing shows a class that has three read/write simple properties: public class Box {
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private double depth, height, width; public double getDepth( ) { return depth; } public void setDepth(double d) { depth = d; } public double getHeight( ) { return height; } public void setHeight(double h) { height = h; } public double getWidth( ) { return width; } public void setWidth(double w) { width = w; }
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Boolean Properties
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A Boolean property has a value of true or false It can be identified by the following design patterns, where N is the name of the property: public boolean isN( ); public boolean getN( ); public void setN(boolean value); Either the first or second pattern can be used to retrieve the value of a Boolean property However, if a class has both of these methods, the first pattern is used The following listing shows a class that has one Boolean property: public class Line { private boolean dotted = false; public boolean isDotted( ) { return dotted; } public void setDotted(boolean dotted) { thisdotted = dotted; } }
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Indexed Properties
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An indexed property consists of multiple values It can be identified by the following design patterns, where N is the name of the property and T is its type: public T getN(int index); public void setN(int index, T value); public T[ ] getN( ); public void setN(T values[ ]); The following listing shows a class that has one read/write indexed property: public class PieChart { private double data[ ]; public double getData(int index) {
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return data[index];
public void setData(int index, double value) { data[index] = value; } public double[ ] getData( ) { return data; } public void setData(double[ ] values) { data = new double[valueslength]; Systemarraycopy(values, 0, data, 0, valueslength); } }
Design Patterns for Events
Beans use the delegation event model that was discussed earlier in this book Beans can generate events and send them to other objects These can be identified by the following design patterns, where T is the type of the event: public void addTListener(TListener eventListener); public void addTListener(TListener eventListener) throws TooManyListeners; public void removeTListener(TListener eventListener); These methods are used by event listeners to register an interest in events of a specific type The first pattern indicates that a Bean can multicast an event to multiple listeners The second pattern indicates that a Bean can unicast an event to only one listener The third pattern is used by a listener when it no longer wishes to receive a specific type of event notification from a Bean The following listing outlines a class that notifies other objects when a temperature value moves outside a specific range The two methods indicated here allow other objects that implement the TemperatureListener interface to receive notifications when this occurs public class Thermometer { public void addTemperatureListener(TemperatureListener tl) { } public void removeTemperatureListener(TemperatureListener tl) { } }
Methods
Design patterns are not used for naming nonproperty methods The introspection mechanism finds all of the public methods of a Bean Protected and private methods are not presented
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