Java Bean Bound Property Change Notification
Given: What is the result? - 
Community Votes
100% of anonymous learners picked answer C. Votes are pick records left by other test-takers — they are not the verified answer.
Community Insight
The core concept is that a bound property fires a change event to listeners only after the field has been successfully updated, leading to the output reflecting the new state.
This question tests the behavior of Java Beans bound properties using PropertyChangeSupport. It establishes that listeners are notified with the new value after the setter updates the internal state.
Candidates often select 'Changed to Test' because they mistakenly believe the listener sees the old value or that the change is not propagated immediately.
Community Discussion (3 comments)
Comments & Corrections
No comments yet — spotted an error or have a note? Share it below.
Expert Analysis
Why the Answer Is Correct
The code utilizesPropertyChangeSupport to implement a bound property pattern in a Java Bean. In the setName method, the assignment this.name = newName; occurs first, updating the object's state. Subsequently, firePropertyChange is called, which notifies registered listeners. Since the field is already updated when the notification fires, any listener printing the value will see "Java". Therefore, the output is "Changed to Java".Why the Other Options Are Wrong
Option D is incorrect because it assumes the listener receives the old value or that the update happens asynchronously later; however, the standard implementation updates the field before firing the event. Option B is incorrect because the code adheres to valid Java syntax and the JavaBeans specification for bound properties. Option A is incorrect because the listener explicitly prints a message.Community Comment Notes
Community consensus strongly supports option C. Users like ASpushkin highlighted that bound properties notify listeners when their value changes, implying the listener sees the current state. Another user confirmed that whenset is called, the new value is set and then the listener is fired with that new value. Exam Strategy
When analyzing Java Bean property change events, always check the order of operations in the setter: does it update the field before or after calling firePropertyChange? The standard convention is update-then-fire.
Frequently Asked Questions
Does firePropertyChange send the old or new value?
It sends both via PropertyChangeEvent. However, if the listener reads the bean's field directly, it gets the new value if the field was updated first.
Why is this considered a bound property?
Because it uses PropertyChangeSupport to notify listeners of changes, allowing other components to react dynamically to state updates.