The correct answer is the call that uses `new double[]{1.0, 2.0, 3.0}` as the argument. This is valid because the method `average(double[] values)` expects a single `double[]` parameter, and the anonymous array method argument syntax—`new double[]{...}`—creates an unnamed array object on the fly that exactly matches that parameter type. On the Oracle Java Foundations 1Z0-811 exam, this concept tests your understanding of how to pass an array literal directly to a method without first assigning it to a variable, a common scenario in real-world coding. A frequent trap is trying to use `{1.0, 2.0, 3.0}` alone, which only works in variable declarations, not as a method argument. Remember the memory tip: “Anonymous arrays need the `new` keyword and type—just curly braces won’t compile in a method call.”
1Z0-811 Arrays and Methods Practice Question
This 1Z0-811 practice question tests your understanding of arrays and methods. 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.
A method that calculates the average of an array of doubles is defined as:
public static double average(double[] values) {
double sum = 0;
for (double v : values) sum += v;
return sum / values.length;
}
Option B is correct because the method `average(double[] values)` expects a single argument of type `double[]`. The expression `new double[]{1.0, 2.0, 3.0}` creates an anonymous array object that matches the parameter type exactly, so the call compiles and runs correctly.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
double avg = average(1.0, 2.0);
Why it's wrong here
This passes two doubles, not an array, so it does not match the parameter type.
This creates a double array and passes it to the method.
Related concept
Read the scenario before looking for a memorised answer.
✗
double avg = average(1.0, 2.0, 3.0);
Why it's wrong here
This syntax is only valid with varargs; the method expects an array, not a list of arguments.
✗
double avg = average({1.0, 2.0, 3.0});
Why it's wrong here
Anonymous array initializer syntax like {...} is only allowed in declaration statements, not as an argument.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Oracle often tests the difference between array initializer syntax and anonymous array creation, trapping candidates who think `{1.0, 2.0, 3.0}` can be used as a method argument without the `new double[]` prefix.
Detailed technical explanation
How to think about this question
In Java, array initializer syntax (`{...}`) is a special construct that can only be used in a variable declaration or as part of an array creation expression (`new double[]{...}`). The method parameter type is `double[]`, so the argument must be a reference to an array object; passing multiple primitives directly would require varargs (`double... values`) to be accepted. Understanding this distinction is critical when overloading methods or designing APIs that accept collections of values.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Arrays and Methods — This question tests Arrays and Methods — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: double avg = average(new double[]{1.0, 2.0, 3.0}); — Option B is correct because the method `average(double[] values)` expects a single argument of type `double[]`. The expression `new double[]{1.0, 2.0, 3.0}` creates an anonymous array object that matches the parameter type exactly, so the call compiles and runs correctly.
What should I do if I get this 1Z0-811 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This 1Z0-811 practice question is part of Courseiva's free Oracle certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 1Z0-811 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.