1Z0-829 Java I/O API and Securing Applications Practice Question
Which TWO statements about Java serialization are true?
⚠ Common exam trap
Many exam-takers assume constructors are always called during object creation, but Java serialization bypasses constructors for the serialized class, which can lead to unexpected behavior if initialization logic is missing.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
During deserialization, the constructor of the serialized class is not invoked.
During deserialization, Java does not invoke the constructor of the class being deserialized. Instead, the object is reconstructed from the serialized stream data using the no-arg constructor of the first non-serializable superclass (if any), and the serialized class's fields are populated via reflection or readObject() methods. This avoids re-executing initialization logic that may have side effects or depend on runtime state.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The serialVersionUID must be explicitly declared in every serializable class.
Why it's wrong here
If not declared, Java computes one automatically.
- ✓
During deserialization, the constructor of the serialized class is not invoked.
Why this is correct
Deserialization uses special mechanism without constructor.
- ✗
A class that implements Externalizable does not need to implement Serializable.
Why it's wrong here
Externalizable extends Serializable.
- ✓
Static fields are not serialized during serialization.
Why this is correct
Static fields belong to class, not instance.
- ✗
Fields marked as transient are serialized by default.
Why it's wrong here
Transient fields are excluded from serialization.
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