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| Class Diagram Summary | |
| nullObject | |
| Interface Summary | |
| NullObject | Marker interface to be implemented by Null Objects--objects which serve to decrease number of null tests. |
| Class Summary | |
| NullPropertyChangeSupport | This class has private constructor and can't to be created by anyone |
| NullVetoableChangeSupport | This class has private constructor and can't to be created by anyone |
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