The correct answer is that the code compiles and runs, producing output due to fall-through behavior. This occurs because in a Java switch statement, once a matching case label is found, execution continues sequentially through all subsequent cases—including the default case—until a break statement is encountered. Here, case 10 matches, printing "ten ", then falls through to default (printing "default "), and finally to case 20 (printing "twenty "), resulting in the output "ten default twenty ". On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, this concept tests your understanding of switch statement fall-through behavior, a common trap where candidates mistakenly assume each case automatically exits. The exam often places the default case in non-standard positions to catch those who forget that fall-through applies regardless of order. A reliable memory tip: think of a waterfall—once the first case matches, every case below it flows until a break dam stops the current.
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.
Which TWO correctly describe the behavior of the following code?
```java
int x = 10;
switch (x) {
case 10: System.out.print("ten ");
default: System.out.print("default ");
case 20: System.out.print("twenty ");
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The output is 'ten default twenty '.
Option D is correct because in a Java switch statement, once a matching case is found, all subsequent cases (including the default case) are executed in order until a break statement is encountered. Here, case 10 matches, so it prints 'ten ', then falls through to default (prints 'default '), then falls through to case 20 (prints 'twenty '), producing 'ten default twenty '. This is known as fall-through behavior.
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.
✗
The default case is never executed because a matching case exists.
Why it's wrong here
Default executes due to fall-through from case 10.
✗
The output is 'ten default ' because case 20 is skipped.
Why it's wrong here
Case 20 is not skipped; it prints after default.
✗
The code does not compile because default must be the last case.
Why it's wrong here
Default can appear anywhere, though unusual.
✓
The output is 'ten default twenty '.
Why this is correct
Correct sequence: ten, default, twenty.
Related concept
Read the scenario before looking for a memorised answer.
✓
The code compiles and runs, producing output due to fall-through.
Why this is correct
No break statements cause fall-through.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates mistakenly believe the default case is optional or must be last, or that a matching case prevents fall-through, when in fact Java executes all subsequent cases (including default) until a break or the end of the switch block.
Detailed technical explanation
How to think about this question
Under the hood, the Java switch statement evaluates the expression and jumps to the matching case label; without a break, execution continues sequentially through all subsequent case and default labels. This fall-through behavior is a deliberate language design that allows multiple cases to share the same code block, but it often leads to bugs if break statements are omitted. In real-world scenarios, developers must carefully use break or return to prevent unintended fall-through, especially when default is placed before other cases.
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.
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: The output is 'ten default twenty '. — Option D is correct because in a Java switch statement, once a matching case is found, all subsequent cases (including the default case) are executed in order until a break statement is encountered. Here, case 10 matches, so it prints 'ten ', then falls through to default (prints 'default '), then falls through to case 20 (prints 'twenty '), producing 'ten default twenty '. This is known as fall-through behavior.
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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