Quick Answer
The correct output is Hello World. This result occurs because Java’s + operator performs string concatenation by combining the exact contents of each operand in sequence; s1 holds "Hello" and s2 holds " World" (with a leading space), so the concatenation yields "Hello World" without any automatic trimming or insertion of additional spaces. On the Oracle Java Foundations 1Z0-811 exam, this question tests your understanding that string concatenation with space is handled explicitly by the programmer—the space must already exist in one of the strings, as it does here in s2. A common trap is assuming Java inserts a space between concatenated strings, but it never does; the output reflects exactly what is stored in the variables. Memory tip: think of the + operator as a glue that sticks strings together exactly as they are—if you want a space, you must provide it yourself.
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.
What is the result of the following code? String s1 = "Hello"; String s2 = " World"; String s3 = s1 + s2; System.out.println(s3);
HelloWorld
Why wrong: Missing space; the literal includes a space.
Hello World
Why wrong: Extra space at the end - not present.
Compilation error
Why wrong: No error; string concatenation is valid.
Hello World
Correct: concatenation yields 'Hello World'.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Hello World
Option D is correct because the + operator performs string concatenation in Java. s1 + s2 combines "Hello" and " World" to produce "Hello World", which is then printed. The space is part of s2, so the output includes it.
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.
HelloWorld
Why it's wrong here
Missing space; the literal includes a space.
Hello World
Why it's wrong here
Extra space at the end - not present.
Compilation error
Why it's wrong here
No error; string concatenation is valid.
Hello World
Why this is correct
Correct: concatenation yields 'Hello World'.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Oracle often tests whether candidates notice the leading space in s2 (" World") versus assuming no space, leading them to choose Option A ("HelloWorld") instead of the correct output with the space.
Detailed technical explanation
Under the hood, the + operator for strings is compiled to StringBuilder.append() calls (or String.concat() in older versions) to avoid creating multiple intermediate String objects. This is efficient for simple concatenations but can lead to performance issues in loops if not using StringBuilder explicitly. In real-world scenarios, understanding this helps avoid unnecessary object creation in high-frequency string operations.
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.
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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: Hello World — Option D is correct because the + operator performs string concatenation in Java. s1 + s2 combines "Hello" and " World" to produce "Hello World", which is then printed. The space is part of s2, so the output includes it.
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
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.
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