1Z0-829 Controlling Program Flow Practice Question
This 1Z0-829 practice question tests your understanding of controlling program flow. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
$ cat Test.java
public class Test {
public static void main(String[] args) {
String s = "Hello";
switch (s) {
case "Hello": System.out.print("1");
case "World": System.out.print("2");
default: System.out.print("3");
}
}
}
$ java Test
Refer to the exhibit.
$ cat Test.java
public class Test {
public static void main(String[] args) {
String s = "Hello";
switch (s) {
case "Hello": System.out.print("1");
case "World": System.out.print("2");
default: System.out.print("3");
}
}
}
$ java Test
A
13
Why wrong: Incorrect; case "World" also executes.
B
123
Correct: prints all three due to fall-through.
C
12
Why wrong: Incorrect; it falls through to default as well.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
123
The code uses a labeled break statement (`break outer;`) inside a nested loop. When the condition `i == 1` is met, the break terminates the outer loop immediately, so the inner loop only completes its first iteration (j=0,1,2) before the outer loop exits. This prints "1", "2", and "3" from the inner loop, resulting in output "123". Option B is correct.
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.
✗
13
Why it's wrong here
Incorrect; case "World" also executes.
✓
123
Why this is correct
Correct: prints all three due to fall-through.
Related concept
Read the scenario before looking for a memorised answer.
✗
12
Why it's wrong here
Incorrect; it falls through to default as well.
✗
1
Why it's wrong here
Incorrect; fall-through occurs.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often forget the inner loop completes its current iteration before the labeled break exits the outer loop, leading them to think only "1" is printed or that the break happens mid-inner-loop.
Detailed technical explanation
How to think about this question
Labeled breaks in Java allow control to exit a specific outer block, not just the innermost loop. Under the hood, the JVM uses a jump instruction to the label's target, skipping remaining iterations. This is useful in scenarios like searching a multi-dimensional array where you want to stop all loops upon finding a match, avoiding unnecessary iterations.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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.
Controlling Program Flow — This question tests Controlling Program Flow — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 123 — The code uses a labeled break statement (`break outer;`) inside a nested loop. When the condition `i == 1` is met, the break terminates the outer loop immediately, so the inner loop only completes its first iteration (j=0,1,2) before the outer loop exits. This prints "1", "2", and "3" from the inner loop, resulting in output "123". Option B is correct.
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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Question Discussion
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