1Z0-811 Primitives, Strings and Operators Practice Question
Which TWO of the following are valid Java identifiers? (Choose 2)
⚠ Common exam trap
Oracle often tests the rule that identifiers cannot start with a digit and cannot contain special characters like # or -, but candidates may mistakenly think hyphens or hash symbols are allowed because they appear in other programming contexts or variable naming conventions.
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
✓
$value
($value) is correct because Java allows identifiers to begin with a dollar sign ($) or underscore (_), and the rest can include letters, digits, or these special characters. The dollar sign is a valid starting character per the Java Language Specification (JLS §3.8), so $value is a legal identifier.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
$value
Why this is correct
Valid: starts with $.
- ✗
my#var
Why it's wrong here
# not allowed.
- ✗
my-var
Why it's wrong here
Hyphen not allowed.
- ✓
_myVar
Why this is correct
Valid: starts with underscore.
- ✗
2ndPlace
Why it's wrong here
Cannot start with digit.
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