1Z0-811 Primitives, Strings and Operators Practice Question
What is the default value of a boolean variable in Java?
⚠ Common exam trap
Oracle often tests the distinction between default values for primitives vs. objects, and the trap here is that candidates confuse boolean's default with the default for Boolean (which is null) or mistakenly think boolean defaults to true or a numeric value.
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
✓
false
In Java, the default value of a boolean variable (when declared as a class field or instance variable) is 'false'. This is specified by the Java Language Specification (JLS §4.12.5), which defines default values for all primitive types. Unlike local variables, which must be explicitly initialized, instance and static variables receive default values automatically.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
null
Why it's wrong here
null is for objects.
- ✗
true
Why it's wrong here
Default is false.
- ✓
false
Why this is correct
Correct.
- ✗
0
Why it's wrong here
Not a boolean value.
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