- A
The condition always evaluates to true
Why wrong: This would be true in some languages like C, but not Java.
- B
It executes the block if x equals 10
Why wrong: Assignment is not comparison; syntax error.
- C
Runtime exception thrown
Why wrong: No code runs.
- D
Compilation error
x=10 is an assignment expression, returning int, which cannot be used as boolean.
Question 231 of 509
1Z0-811 Control Flow and Loops Practice Question
This 1Z0-811 practice question tests your understanding of control flow and loops. 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.
A novice developer wrote a condition: if (x = 10) { ... } What is the result?
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
✓
Compilation error
In Java, the assignment operator `=` is used to assign a value, not to compare values. The condition `if (x = 10)` attempts to assign 10 to `x` within an `if` statement, which is not a boolean expression. Java requires the condition in an `if` statement to evaluate to a `boolean`, so this code will not compile. Option D is correct because the compiler will report an error, typically stating 'incompatible types: int cannot be converted to boolean'.
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 condition always evaluates to true
Why it's wrong here
This would be true in some languages like C, but not Java.
- ✗
It executes the block if x equals 10
Why it's wrong here
Assignment is not comparison; syntax error.
- ✗
Runtime exception thrown
Why it's wrong here
No code runs.
- ✓
Compilation error
Why this is correct
x=10 is an assignment expression, returning int, which cannot be used as boolean.
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 from other programming backgrounds (like C or JavaScript) may expect the assignment to be treated as a truthy value, but Java strictly requires a boolean condition, making this a compilation error.
Detailed technical explanation
How to think about this question
Java's type system strictly enforces that the condition in an `if` statement must be a `boolean` expression. The assignment operator `=` returns the assigned value (in this case, 10), which is an `int`, not a `boolean`. This is different from languages like C or C++, where assignment expressions can be used as conditions (non-zero values are treated as true). In Java, this design prevents a common source of bugs where a developer accidentally uses `=` instead of `==` for comparison.
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 1Z0-811 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.
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Control Flow and Loops — study guide chapter
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FAQ
Questions learners often ask
What does this 1Z0-811 question test?
Control Flow and Loops — This question tests Control Flow and Loops — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Compilation error — In Java, the assignment operator `=` is used to assign a value, not to compare values. The condition `if (x = 10)` attempts to assign 10 to `x` within an `if` statement, which is not a boolean expression. Java requires the condition in an `if` statement to evaluate to a `boolean`, so this code will not compile. Option D is correct because the compiler will report an error, typically stating 'incompatible types: int cannot be converted to boolean'.
What should I do if I get this 1Z0-811 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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Last reviewed: Jul 4, 2026
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