question: protected final void fireVetoableChange ( String propertyName , int oldValue , int newValue ) throws PropertyVetoException { VetoableChangeSupport aVetoSupport = this . vetoSupport ; if ( aVetoSupport == null ) { return ; } aVetoSupport . fireVetoableChange ( propertyName , Integer . valueOf ( oldValue ) , Integer . valueOf ( newValue ) ) ; }
target:  Support for reporting changes for constrained integer properties. This method can be called before a constrained property will be changed and it will send the appropriate PropertyChangeEvent to any registered VetoableChangeListeners.