Quick Answer
The answer is printElements({1,2,3}); because this invocation causes a compilation error. The varargs parameter int... numbers expects either a sequence of individual int values or a reference to an int[] array, but the array initializer syntax {1,2,3} is only valid in a variable declaration or as part of an array creation expression like new int[]{1,2,3}. Passing it directly as an argument violates Java’s syntax rules, making this the incorrect invocation. On the Oracle Java Foundations 1Z0-811 exam, this question tests your understanding of varargs invocation and array initializer compile error scenarios—a common trap where candidates mistakenly treat anonymous array initializers as valid method arguments. Remember the memory tip: an array initializer without the new keyword is like a sentence without a verb—it needs a declaration or creation expression to be grammatically correct in Java.
This 1Z0-811 practice question tests your understanding of arrays and methods. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
A method is declared as 'public void printElements(int... numbers)'. Which invocation will cause a compilation error?
printElements({1,2,3});
Invalid syntax; must be new int[]{1,2,3}.
printElements(1, 2, 3);
Why wrong: Valid varargs invocation with multiple ints.
printElements();
Why wrong: Valid varargs invocation with zero arguments.
printElements(new int[]{1,2,3});
Why wrong: Valid varargs invocation with an array.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
printElements({1,2,3});
Option A is correct because the syntax `{1,2,3}` is an array initializer that can only be used in a variable declaration or as part of an array creation expression (e.g., `new int[]{1,2,3}`). It cannot be passed directly as an argument to a varargs method. The varargs parameter `int... numbers` expects either a sequence of `int` values or an `int[]` array reference, but not an anonymous array initializer.
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.
printElements({1,2,3});
Why this is correct
Invalid syntax; must be new int[]{1,2,3}.
Related concept
Read the scenario before looking for a memorised answer.
printElements(1, 2, 3);
Why it's wrong here
Valid varargs invocation with multiple ints.
printElements();
Why it's wrong here
Valid varargs invocation with zero arguments.
printElements(new int[]{1,2,3});
Why it's wrong here
Valid varargs invocation with an array.
Common exam traps
The trap here is that candidates mistakenly think an array initializer like `{1,2,3}` can be used anywhere an array is expected, but in Java it is only valid in declarations or with `new` — not as a standalone method argument.
Detailed technical explanation
Varargs in Java is syntactic sugar that the compiler translates into an array parameter. At the bytecode level, the method signature becomes `public void printElements(int[])`, and the compiler inserts array creation code for calls with multiple arguments. A key subtlety is that varargs can accept either an array reference or a sequence of arguments, but not an array initializer (which is not an expression). This distinction matters in real-world APIs like `String.format(String format, Object... args)` where you must pass either individual objects or an explicit `Object[]`.
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
Arrays and Methods — This question tests Arrays and Methods — Read the scenario before looking for a memorised answer..
The correct answer is: printElements({1,2,3}); — Option A is correct because the syntax `{1,2,3}` is an array initializer that can only be used in a variable declaration or as part of an array creation expression (e.g., `new int[]{1,2,3}`). It cannot be passed directly as an argument to a varargs method. The varargs parameter `int... numbers` expects either a sequence of `int` values or an `int[]` array reference, but not an anonymous array initializer.
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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Last reviewed: Jun 25, 2026
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