This 1Z0-811 practice question tests your understanding of primitives, strings and operators. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 of the following statements about the String class is true?
Strings can be modified using the '+' operator
Why wrong: Incorrect: '+' concatenation creates a new String, the original remains unchanged.
String objects can be created only with the 'new' keyword
Why wrong: Incorrect: String literals also create String objects.
Strings are immutable
Correct: once created, a String object cannot be changed.
String is a primitive type
Why wrong: Incorrect: String is a class (reference type).
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Strings are immutable
Option C is correct because String objects in Java are immutable, meaning once a String object is created, its value cannot be changed. Any operation that appears to modify a String, such as concatenation, actually creates a new String object. This immutability is a fundamental design choice that enables String pooling, thread safety, and efficient caching of hash codes.
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.
Strings can be modified using the '+' operator
Why it's wrong here
Incorrect: '+' concatenation creates a new String, the original remains unchanged.
String objects can be created only with the 'new' keyword
Why it's wrong here
Incorrect: String literals also create String objects.
Strings are immutable
Why this is correct
Correct: once created, a String object cannot be changed.
Related concept
Read the scenario before looking for a memorised answer.
String is a primitive type
Why it's wrong here
Incorrect: String is a class (reference type).
Common exam traps
Oracle often tests the misconception that the '+' operator modifies the original String, leading candidates to choose option A, when in fact it creates a new String object and the original remains unchanged.
Detailed technical explanation
Under the hood, String immutability is enforced by making the internal char array (or byte array in modern Java) final and not exposing any mutator methods. When using the '+' operator for concatenation, the Java compiler often translates it into StringBuilder.append() calls to avoid creating intermediate String objects, but the final result is still a new String. This immutability is critical for the security of class loading, network connections, and database URLs, where a mutable string could be exploited to change sensitive values after validation.
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: Strings are immutable — Option C is correct because String objects in Java are immutable, meaning once a String object is created, its value cannot be changed. Any operation that appears to modify a String, such as concatenation, actually creates a new String object. This immutability is a fundamental design choice that enables String pooling, thread safety, and efficient caching of hash codes.
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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