Quick Answer
The correct output is true. This occurs because `Boolean.valueOf(true)` returns the cached singleton `Boolean.TRUE`, and the `==` operator in Java compares object references, not values; since both refer to the exact same object in memory, the comparison yields true. On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, this question tests your understanding of Boolean caching and the `==` operator, a common trap where developers mistakenly expect `==` to compare primitive values rather than references. The key insight is that `Boolean.valueOf()` and `Boolean.TRUE` both point to the same static final instance due to the Boolean class’s internal cache for `true` and `false`. A helpful memory tip: think of `==` as asking “are these the same object?” not “are these equal in value?”—for value equality, always use `.equals()`.
This 1Z0-829 practice question tests your understanding of handling date, time, text, numeric and boolean values. 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.
Boolean b1 = Boolean.valueOf("true");
Boolean b2 = Boolean.valueOf("True");
System.out.println(b1 == b2);Refer to the exhibit. What is the output?
Boolean b1 = Boolean.valueOf("true");
Boolean b2 = Boolean.valueOf("True");
System.out.println(b1 == b2);compile error
Why wrong: Incorrect: The code compiles and runs.
null
Why wrong: Incorrect: valueOf never returns null.
false
Why wrong: Incorrect: b1 and b2 reference the same Boolean.TRUE object.
true
Correct: Both return Boolean.TRUE, so == compares reference and is true.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
true
Option D is correct because the code uses `Boolean.valueOf(true)` which returns the `Boolean` constant `Boolean.TRUE`, and `Boolean.TRUE` is a singleton object that is `==` to itself. The `==` operator compares object references, not values, so the comparison `Boolean.valueOf(true) == Boolean.TRUE` evaluates to `true` because both refer to the same cached `Boolean` instance from the `Boolean` class's static final fields.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
compile error
Why it's wrong here
Incorrect: The code compiles and runs.
null
Why it's wrong here
Incorrect: valueOf never returns null.
false
Why it's wrong here
Incorrect: b1 and b2 reference the same Boolean.TRUE object.
true
Why this is correct
Correct: Both return Boolean.TRUE, so == compares reference and is true.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates mistakenly think `Boolean.valueOf(true)` returns a primitive `boolean` or a new object each time, leading them to believe `==` compares values or that the result is `false`, when in fact `valueOf` returns the cached singleton `Boolean.TRUE`.
Detailed technical explanation
The `Boolean.valueOf(boolean)` method uses a caching mechanism: it returns `Boolean.TRUE` for `true` input and `Boolean.FALSE` for `false` input, both of which are `public static final` constants defined in the `Boolean` class. This is an example of the Flyweight design pattern, ensuring that only two `Boolean` objects exist per JVM. In real-world scenarios, using `==` to compare `Boolean` objects obtained via `valueOf` is safe because of this caching, but comparing `Boolean` objects created with `new Boolean(true)` would fail reference equality, leading to subtle bugs.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Handling Date, Time, Text, Numeric and Boolean Values — This question tests Handling Date, Time, Text, Numeric and Boolean Values — Read the scenario before looking for a memorised answer..
The correct answer is: true — Option D is correct because the code uses `Boolean.valueOf(true)` which returns the `Boolean` constant `Boolean.TRUE`, and `Boolean.TRUE` is a singleton object that is `==` to itself. The `==` operator compares object references, not values, so the comparison `Boolean.valueOf(true) == Boolean.TRUE` evaluates to `true` because both refer to the same cached `Boolean` instance from the `Boolean` class's static final fields.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
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