This 1Z0-811 practice question tests your understanding of primitives, strings and operators. 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.
Refer to the exhibit.
public class ConcatTest {
public static void main(String[] args) {
String s = "Result: " + 2 + 3;
System.out.println(s);
}
}What is the output?
Refer to the exhibit.
public class ConcatTest {
public static void main(String[] args) {
String s = "Result: " + 2 + 3;
System.out.println(s);
}
}Result: 23
String concatenation converts numbers to strings.
Result: 2 3
Why wrong: No space.
Result: 5
Why wrong: Addition would only occur if numbers were added first.
Result: 2+3
Why wrong: Operators are evaluated.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Result: 23
The code `System.out.println("Result: " + 2 + 3);` uses string concatenation. In Java, the `+` operator is left-associative, so the expression is evaluated as `("Result: " + 2) + 3`. First, the integer `2` is converted to the string `"2"` and concatenated with `"Result: "` to form `"Result: 2"`. Then, the integer `3` is converted to the string `"3"` and concatenated, producing `"Result: 23"`. Option A is correct because the output is the string `"Result: 23"`.
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.
Result: 23
Why this is correct
String concatenation converts numbers to strings.
Related concept
Read the scenario before looking for a memorised answer.
Result: 2 3
Why it's wrong here
No space.
Result: 5
Why it's wrong here
Addition would only occur if numbers were added first.
Result: 2+3
Why it's wrong here
Operators are evaluated.
Common exam traps
Oracle often tests the left-to-right associativity of the `+` operator and the implicit conversion to strings when a string operand is present, tricking candidates into thinking the integers are added numerically before concatenation.
Detailed technical explanation
Under the hood, Java's `+` operator for strings is implemented via `StringBuilder` (or `StringBuffer` in older versions) to avoid creating multiple intermediate `String` objects. The left-to-right evaluation means that as soon as one operand is a `String`, the `+` becomes concatenation, converting all subsequent operands to strings via their `toString()` method (or `String.valueOf()` for primitives). This behavior is defined in JLS §15.18.1 and is a common source of confusion when mixing strings and numbers in expressions.
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
Primitives, Strings and Operators — This question tests Primitives, Strings and Operators — Read the scenario before looking for a memorised answer..
The correct answer is: Result: 23 — The code `System.out.println("Result: " + 2 + 3);` uses string concatenation. In Java, the `+` operator is left-associative, so the expression is evaluated as `("Result: " + 2) + 3`. First, the integer `2` is converted to the string `"2"` and concatenated with `"Result: "` to form `"Result: 2"`. Then, the integer `3` is converted to the string `"3"` and concatenated, producing `"Result: 23"`. Option A is correct because the output is the string `"Result: 23"`.
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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