[Chapter 23] 23.15 java.beans.PropertyDescriptor (JDK 1.1)

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| Chapter 23 The java.beans Package |

## 23.15 java.beans.PropertyDescriptor (JDK 1.1)

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A `PropertyDescriptor` object is a type of `FeatureDescriptor` that describes a single property of a Java bean. The `BeanInfo` class for a Java bean optionally creates and initializes `PropertyDescriptor` objects to describe the properties that the bean supports. Typically, only application builders and similar tools use the `get` and `is` methods to obtain this property description information.

You create a `PropertyDescriptor` by specifying the name of the property and the `Class` object for the bean. If you have not followed the standard "design patterns" for accessor method naming, you may also specify the accessor methods for the property. Once a `PropertyDescriptor` is created, the `setBound()` and `setConstrained()` methods allow you to specify whether the property is bound and/or constrained. `setPropertyEditorClass()` allows you to specify a specific property editor that should be used to edit the value of this property (this is useful, for example, when the property is an enumerated type with a specific list of supported values). The methods of the `FeatureDescriptor` superclass allow additional information about the property to be specified.

    public class PropertyDescriptor extends FeatureDescriptor {
        // Public Constructors
                public PropertyDescriptor(String propertyName, Class beanClass) throws IntrospectionException;
                public PropertyDescriptor(String propertyName, Class beanClass, String getterName,
                public PropertyDescriptor'u'String setterName) throws IntrospectionException;
                public PropertyDescriptor(String propertyName, Method getter, Method setter) throws IntrospectionException;
        // Public Instance Methods
                public Class getPropertyEditorClass();
                public Class getPropertyType();
                public Method getReadMethod();
                public Method getWriteMethod();
                public boolean isBound();
                public boolean isConstrained();
                public void setBound(boolean bound);
                public void setConstrained(boolean constrained);
                public void setPropertyEditorClass(Class propertyEditorClass);
    }

### Hierarchy:

Object->FeatureDescriptor->PropertyDescriptor

### Extended By:

IndexedPropertyDescriptor

### Returned By:

BeanInfo.getPropertyDescriptors(), SimpleBeanInfo.getPropertyDescriptors()

java.beans.PropertyChangeSupport (JDK 1.1) |  | java.beans.PropertyEditor (JDK 1.1)