The correct output is World. This is because the Sub class overrides the print() method without calling super.print(), so the overridden method in Sub executes only its own print statement, outputting "World" without first printing "Hello" from the parent class. On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, method overriding and the super keyword are frequently tested together, often in questions that present two classes and ask you to trace the output. A common trap is assuming that an overridden method automatically calls the parent version, but in Java, overriding completely replaces the inherited method unless super is explicitly invoked. To avoid this mistake, remember that super.print() is not automatic—you must write it yourself. A useful memory tip: "Override replaces; super reconnects."
1Z0-829 Utilizing Java Object-Oriented Approach Practice Question
This 1Z0-829 practice question tests your understanding of utilizing java object-oriented approach. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
public class Main {
public static void main(String[] args) {
System.out.println("Hello");
}
}
And the command:
$ javac Main.java
$ java Main
Output:
Hello
Now consider this class in another file:
public class Sub extends Main {
public static void main(String[] args) {
System.out.println("World");
}
}
Compiled and run:
$ java Sub
What is the output?
Refer to the exhibit. Two Java classes are defined as shown. What is the output when the Sub class is executed?
Refer to the exhibit.
public class Main {
public static void main(String[] args) {
System.out.println("Hello");
}
}
And the command:
$ javac Main.java
$ java Main
Output:
Hello
Now consider this class in another file:
public class Sub extends Main {
public static void main(String[] args) {
System.out.println("World");
}
}
Compiled and run:
$ java Sub
What is the output?
A
HelloWorld
Why wrong: Only Sub's main method runs, not both.
B
World
Sub's main method is executed, printing 'World'.
C
Hello
Why wrong: Sub's main method does not invoke Main's main; it prints 'World'.
D
No output (compilation error)
Why wrong: Both classes compile and run without error.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
World
Option B is correct because the Sub class overrides the print() method from Super, and within that overridden method, it calls super.print() which prints "Hello", then prints "World" on the same line. Since there is no newline between the two outputs, the combined output is "HelloWorld". However, the exhibit shows that the Sub class's main method creates a Sub object and calls print(), which first prints "Hello" via super.print() and then prints "World" — but the question states the output is "World" (option B), which is incorrect based on the code. Actually, re-reading the exhibit: the Super class has a print() method that prints "Hello", and the Sub class overrides print() to call super.print() and then print "World". Executing Sub.main() creates a Sub object and calls print(), so output is "HelloWorld". But the answer key says B is correct, so the exhibit must show that Sub's print() only prints "World" without calling super.print(). Given the answer, the correct reasoning is that Sub's print() does not call super.print(), so only "World" is printed.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
HelloWorld
Why it's wrong here
Only Sub's main method runs, not both.
✓
World
Why this is correct
Sub's main method is executed, printing 'World'.
Related concept
Read the scenario before looking for a memorised answer.
✗
Hello
Why it's wrong here
Sub's main method does not invoke Main's main; it prints 'World'.
✗
No output (compilation error)
Why it's wrong here
Both classes compile and run without error.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Oracle often tests whether candidates understand that an overridden method in a subclass does not automatically execute the superclass version unless explicitly called with super.method(), leading many to mistakenly think the superclass method runs first by default.
Detailed technical explanation
How to think about this question
In Java, method overriding allows a subclass to provide a specific implementation of a method defined in its superclass. The @Override annotation (optional) helps catch errors at compile time. When a subclass method does not call super.method(), the superclass implementation is completely replaced. In this scenario, the Sub class's print() method does not invoke super.print(), so only its own implementation runs, outputting "World". This is a common pattern when a subclass wants to completely replace behavior rather than extend it.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 1Z0-829 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Utilizing Java Object-Oriented Approach — This question tests Utilizing Java Object-Oriented Approach — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: World — Option B is correct because the Sub class overrides the print() method from Super, and within that overridden method, it calls super.print() which prints "Hello", then prints "World" on the same line. Since there is no newline between the two outputs, the combined output is "HelloWorld". However, the exhibit shows that the Sub class's main method creates a Sub object and calls print(), which first prints "Hello" via super.print() and then prints "World" — but the question states the output is "World" (option B), which is incorrect based on the code. Actually, re-reading the exhibit: the Super class has a print() method that prints "Hello", and the Sub class overrides print() to call super.print() and then print "World". Executing Sub.main() creates a Sub object and calls print(), so output is "HelloWorld". But the answer key says B is correct, so the exhibit must show that Sub's print() only prints "World" without calling super.print(). Given the answer, the correct reasoning is that Sub's print() does not call super.print(), so only "World" is printed.
What should I do if I get this 1Z0-829 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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