1Z0-829 Practice Question: Handling Date, Time, Text, Numeric and Boolean Values
Which THREE statements are true about the Boolean class? (Choose three.)
⚠ Common exam trap
A common mix-up: candidates 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.
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
✓
The parseBoolean(String) method returns false if the string is null or not equal to "true" (case-insensitive).
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.
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.
- ✗
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.
- ✓
The valueOf(String) method returns Boolean.TRUE or Boolean.FALSE without creating a new instance.
Why this is correct
valueOf returns cached constants.
- ✗
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.
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