Quick Answer
The correct answer is int square(int x) { return x*x; } because the method signature must declare the return type before the method name and include a return statement that matches that type. In Java, the method signature consists of the method name and parameter list, but the return type is a critical part of the method declaration—not the signature itself—that tells the compiler what data type the method will send back. On the Oracle Java Foundations 1Z0-811 exam, this concept tests your understanding that a method returning a value must both specify the return type (like int) and use the return keyword to output the result; a common trap is omitting the return statement or mismatching the return type with the actual value. Remember the mnemonic: “Return type first, return keyword last—match them both to avoid a compile blast.”
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.
A method is expected to receive an integer and return its square. Which method signature is correct?
void square(int x) { return x*x; }
Why wrong: Void method cannot return a value.
public square(int x) { return x*x; }
Why wrong: Missing return type 'int'.
int square(int x) { x*x; }
Why wrong: Missing 'return' keyword.
int square(int x) { return x*x; }
Correct return type and syntax.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
int square(int x) { return x*x; }
Option D is correct because the method signature specifies a return type of 'int' and includes the 'return' keyword to return the squared value. In Java, a method that returns a value must declare the return type before the method name and must use the 'return' statement to send the result back to the caller.
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.
void square(int x) { return x*x; }
Why it's wrong here
Void method cannot return a value.
public square(int x) { return x*x; }
Why it's wrong here
Missing return type 'int'.
int square(int x) { x*x; }
Why it's wrong here
Missing 'return' keyword.
int square(int x) { return x*x; }
Why this is correct
Correct return type and syntax.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Oracle often tests the distinction between method declaration and method signature, and the trap here is that candidates may forget that a non-void method must include a 'return' statement with a matching value, or they may confuse 'void' with a return type that allows returning a value.
Trap categories for this question
Keyword trap
Missing 'return' keyword.
Detailed technical explanation
In Java, the method signature consists of the method name and parameter list, but the return type is part of the method declaration. The 'return' statement is required to exit a non-void method and provide a value that matches the declared return type. Under the hood, the Java compiler checks that every code path in a non-void method leads to a return statement, or it will produce a compilation error.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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: int square(int x) { return x*x; } — Option D is correct because the method signature specifies a return type of 'int' and includes the 'return' keyword to return the squared value. In Java, a method that returns a value must declare the return type before the method name and must use the 'return' statement to send the result back to the caller.
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 30, 2026
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