1Z0-829 Utilizing Java Object-Oriented Approach Practice Question
This 1Z0-829 practice question tests your understanding of utilizing java object-oriented approach. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Exhibit
Refer to the exhibit.
sealed class Shape permits Circle, Square {
abstract double area();
}
final class Circle extends Shape {
double area() { return 0; }
}
non-sealed class Square extends Shape {
double area() { return 0; }
}
class Triangle extends Shape { }
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A compilation error occurs in the Triangle class because Triangle is not listed in the permits clause.
The Triangle class is not listed in the permits clause of Shape, so it cannot extend Shape. This causes a compilation error.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 compilation error occurs in the Triangle class because Triangle is not listed in the permits clause.
Why this is correct
Sealed classes require that all direct subclasses be listed in the permits clause.
Related concept
Standard ACLs match source addresses.
✗
A compilation error occurs because Circle must be declared final.
Why it's wrong here
Circle is already final; that is correct for a sealed class hierarchy.
✗
A compilation error occurs because Shape must be declared abstract.
Why it's wrong here
Shape is already declared abstract; sealed classes can be abstract.
✗
The code compiles successfully.
Why it's wrong here
The Triangle class causes a compilation error because it is not permitted.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 1Z0-829 ACL questions on filtering logic and placement.
Utilizing Java Object-Oriented Approach — This question tests Utilizing Java Object-Oriented Approach — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: A compilation error occurs in the Triangle class because Triangle is not listed in the permits clause. — The Triangle class is not listed in the permits clause of Shape, so it cannot extend Shape. This causes a compilation error.
What should I do if I get this 1Z0-829 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 1Z0-829 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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