Quick Answer
The answer is myVar123, as it is a valid Java identifier that follows all the rules defined by the Java Language Specification. Java identifiers must begin with a letter, an underscore (_), or a dollar sign ($), and subsequent characters can include any of those plus digits (0-9); myVar123 starts with a letter and contains only letters and digits, making it perfectly compliant. On the Oracle Java Foundations 1Z0-811 exam, this concept tests your understanding of the exact set of allowed starting and subsequent characters, often appearing in multiple-choice questions that mix valid and invalid examples. A common trap is assuming that digits can start an identifier or that special characters like @ or # are allowed, so remember that only $ and _ are permitted as non-alphanumeric starting symbols. For a quick memory tip, think of the mnemonic "LUD$" — Letters, Underscores, and Dollars are the only ways to begin a valid Java identifier.
This 1Z0-811 practice question tests your understanding of java basics and syntax. 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 are valid Java identifiers? (Choose three.)
$dollar
Starts with dollar sign, valid.
my var
Why wrong: Contains space, invalid.
2ndValue
Why wrong: Starts with digit, invalid.
_value
Starts with underscore, valid.
myVar123
Valid combination of letters and digits.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
$dollar
Option A is correct because Java identifiers can start with a dollar sign ($), which is a valid identifier character according to the Java Language Specification (JLS). The $dollar follows the rule that identifiers must begin with a letter, underscore, or dollar sign, and subsequent characters can include letters, digits, underscores, or dollar signs.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
$dollar
Why this is correct
Starts with dollar sign, valid.
Related concept
Read the scenario before looking for a memorised answer.
my var
Why it's wrong here
Contains space, invalid.
2ndValue
Why it's wrong here
Starts with digit, invalid.
_value
Why this is correct
Starts with underscore, valid.
Related concept
Read the scenario before looking for a memorised answer.
myVar123
Why this is correct
Valid combination of letters and digits.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Oracle often tests the rule that identifiers cannot start with a digit, leading candidates to mistakenly think '2ndValue' is valid because it contains letters, while overlooking the initial digit violation.
Detailed technical explanation
Under the hood, Java identifiers are defined by the JLS §3.8, which specifies that identifiers must start with a Java letter (which includes Unicode letters, underscore, and dollar sign) and can be followed by Java letters or digits. The dollar sign is often used in generated code (e.g., inner class names like Outer$Inner) or by tools, but it is not recommended for user-defined identifiers due to potential confusion. Real-world scenarios include naming variables in financial applications where $dollar might be used for currency-related fields, though it is unconventional.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the 1Z0-811 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
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FAQ
Java Basics and Syntax — This question tests Java Basics and Syntax — Read the scenario before looking for a memorised answer..
The correct answer is: $dollar — Option A is correct because Java identifiers can start with a dollar sign ($), which is a valid identifier character according to the Java Language Specification (JLS). The $dollar follows the rule that identifiers must begin with a letter, underscore, or dollar sign, and subsequent characters can include letters, digits, underscores, or dollar signs.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Same concept, more angles
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which TWO of the following are valid Java identifiers? (Choose two.)
easyWhy B: In Java, identifiers must start with a letter, underscore, or dollar sign, and subsequent characters can include digits. Reserved words cannot be used. _myVariable and $value are valid. 2ndPlace starts with a digit, my-var contains a hyphen, and class is a reserved word.
Variation 2. Which TWO are valid identifiers in Java? (Choose two.)
mediumWhy A: Option A is correct because in Java, identifiers can begin with a letter, an underscore (_), or a dollar sign ($). The dollar sign is a valid starting character, so '$money' is a legal identifier. This is specified in the Java Language Specification (JLS §3.8).
Variation 3. Which TWO are valid Java identifiers? (Choose two.)
easyWhy A: Option A ($test) is a valid Java identifier because identifiers can begin with a dollar sign ($) or an underscore (_), followed by any combination of letters, digits, dollar signs, or underscores. The Java Language Specification (JLS §3.8) explicitly allows the dollar sign as a starting character, though it is conventionally reserved for mechanically generated names.
Last reviewed: Jun 30, 2026
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