1Z0-811 Java Basics and Syntax Practice Question
Which THREE statements about the final keyword in Java are true?
⚠ Common exam trap
Oracle often tests the distinction between a final reference variable and the immutability of the object it refers to, leading candidates to incorrectly assume that a final reference prevents all changes to the object's state.
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
✓
A final variable cannot be reassigned after initialization.
A final variable in Java can only be assigned once. After initialization, any attempt to reassign the variable results in a compile-time error. This ensures the variable's value remains constant throughout its scope.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
A final variable cannot be reassigned after initialization.
Why this is correct
Correct.
- ✓
A final reference variable cannot be made to refer to a different object.
Why this is correct
Correct.
- ✗
A final method can be overridden in a subclass.
Why it's wrong here
Final methods cannot be overridden.
- ✗
A final parameter in a method allows the method to modify the argument value.
Why it's wrong here
Final parameter cannot be changed; it is a local constant.
- ✓
A final class cannot be extended.
Why this is correct
Correct.
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