1Z0-811 Java Basics and Syntax Practice Question
Exhibit
javac Test.java
Test.java:3: error: variable x might not have been initialized
System.out.println(x);
^Refer to the exhibit. What is the likely cause of this error?
⚠ Common exam trap
Oracle often tests the distinction between local variables (which require explicit initialization) and instance/static variables (which get default values), trapping candidates who assume all variables are automatically initialized.
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
✓
x is declared but not initialized
In Java, a local variable must be explicitly initialized before it is used; otherwise, the compiler reports an 'error: variable x might not have been initialized'. The exhibit shows a compilation error, and the most likely cause is that x was declared (e.g., 'int x;') but never assigned a value before being referenced in an expression or printed.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
x is out of scope
Why it's wrong here
Incorrect. The error is about initialization, not scope.
- ✓
x is declared but not initialized
Why this is correct
Correct. The error message clearly states 'might not have been initialized'.
- ✗
x is a duplicate variable
Why it's wrong here
Incorrect. Duplicate variable would cause a different error.
- ✗
x is declared as a different type
Why it's wrong here
Incorrect. No type mismatch error.
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