The correct answer is that the valueOf(String) method returns Boolean.TRUE or Boolean.FALSE without creating a new instance, because it leverages the cached constants from the Boolean class rather than invoking the constructor. This behavior is rooted in the Boolean class’s design as a wrapper that predefines two static final instances, Boolean.TRUE and Boolean.FALSE, making valueOf a memory-efficient factory method. On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, this question tests your understanding of Boolean class methods and constants, specifically how parseBoolean and valueOf differ in handling null and case-insensitive strings. A common trap is assuming parseBoolean throws an exception for null input, but it safely returns false, while valueOf throws a NullPointerException for null. For a quick memory tip, remember that “valueOf returns the constant, parseBoolean parses safely without throwing.”
1Z0-829 Practice Question: Handling Date, Time, Text, Numeric and Boolean Values
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.
Which THREE statements are true about the Boolean class? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The parseBoolean(String) method returns false if the string is null or not equal to "true" (case-insensitive).
Option A is correct because the `Boolean.parseBoolean(String)` method returns `false` for any input that is not exactly equal to `"true"` (case-insensitive), including `null`. This is specified in the Java API documentation and is a common way to safely parse boolean strings without throwing a NullPointerException.
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 parseBoolean(String) method returns false if the string is null or not equal to "true" (case-insensitive).
Why this is correct
parseBoolean returns false for non-matching strings.
Related concept
Read the scenario before looking for a memorised answer.
✗
The Boolean constructor is the preferred way to create a Boolean object.
Why it's wrong here
Boolean constructor is deprecated; valueOf is preferred.
✓
Boolean.TRUE and Boolean.FALSE are static constants.
Why this is correct
Yes, they are predefined static final instances.
Related concept
Read the scenario before looking for a memorised answer.
✓
The valueOf(String) method returns Boolean.TRUE or Boolean.FALSE without creating a new instance.
Why this is correct
valueOf returns cached constants.
Related concept
Read the scenario before looking for a memorised answer.
✗
Boolean has three possible values: true, false, and null.
Why it's wrong here
Boolean is an object wrapper; it can be null, but the boolean primitive has only two values.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the `Boolean` wrapper class's possible reference values (including `null`) with the logical values of the `boolean` primitive, leading them to incorrectly select option E.
Detailed technical explanation
How to think about this question
Under the hood, `Boolean.valueOf(String)` returns the cached constants `Boolean.TRUE` or `Boolean.FALSE`, avoiding object creation, while `parseBoolean(String)` returns a primitive `boolean`. The `Boolean` constructor, deprecated since Java 9, always creates a new instance, which is wasteful. In real-world applications, using `valueOf` or `parseBoolean` is standard for performance and clarity, especially when parsing configuration strings or user input.
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.
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..
What is the correct answer to this question?
The correct answer is: The parseBoolean(String) method returns false if the string is null or not equal to "true" (case-insensitive). — Option A is correct because the `Boolean.parseBoolean(String)` method returns `false` for any input that is not exactly equal to `"true"` (case-insensitive), including `null`. This is specified in the Java API documentation and is a common way to safely parse boolean strings without throwing a NullPointerException.
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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