Quick Answer
The correct choices are "Hello".concat(" World") and any call to String.replace() because both operations return a new String object rather than modifying the original. This stems from the fundamental immutability of the String class in Java: once a String object is created, its value cannot be changed, so every method that appears to alter the string must produce a fresh object in memory. On the Oracle Java Foundations 1Z0-811 exam, this concept frequently appears in questions testing your understanding of immutability versus mutability, often with traps that try to trick you into thinking methods like toUpperCase() or trim() modify the original string. A common memory tip is to remember that every String method that returns a String is creating a new object—the original string stays exactly as it was. Think of it like a photograph: you can make as many edited copies as you want, but the original negative never changes.
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.
Which TWO of the following operations on String objects result in a new String object?
"Hello".toString()
Why wrong: Returns the same string object (this).
"Hello".length()
Why wrong: Returns int.
"Hello".charAt(0)
Why wrong: Returns a primitive char.
"Hello".replace('l', 'p')
Returns new string with replacements.
"Hello".concat(" World")
Returns a new concatenated string.
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".replace('l', 'p')
Option D is correct because `String.replace()` returns a new `String` object with the replacement applied, as `String` is immutable in Java. The original `"Hello"` remains unchanged, and a new string `"Heppo"` is created.
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.
"Hello".toString()
Why it's wrong here
Returns the same string object (this).
"Hello".length()
Why it's wrong here
Returns int.
"Hello".charAt(0)
Why it's wrong here
Returns a primitive char.
"Hello".replace('l', 'p')
Why this is correct
Returns new string with replacements.
Related concept
Read the scenario before looking for a memorised answer.
"Hello".concat(" World")
Why this is correct
Returns a new concatenated string.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Oracle often tests the distinction between methods that return a new `String` versus those that return a primitive or the same reference, exploiting the common misconception that all `String` methods modify the original object.
Detailed technical explanation
Under the hood, `String` immutability means every method that appears to modify the string (like `replace()` or `concat()`) must allocate a new `char[]` array and copy characters, while the original string's internal array remains untouched. This design ensures thread safety and enables string pooling, but can lead to performance overhead in loops if many intermediate strings are created.
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
Primitives, Strings and Operators — This question tests Primitives, Strings and Operators — Read the scenario before looking for a memorised answer..
The correct answer is: "Hello".replace('l', 'p') — Option D is correct because `String.replace()` returns a new `String` object with the replacement applied, as `String` is immutable in Java. The original `"Hello"` remains unchanged, and a new string `"Heppo"` is created.
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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