Question 20 of 481
1Z0-811 Primitives, Strings and Operators Practice Question
Which TWO statements are true about the String class in Java? (Choose 2)
Answer choices
Why each option matters
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.
The correct answers are C and E. Option C is true because String objects in Java are immutable; once created, they cannot be changed. Option E is true because the intern() method places the string into the string pool if it is not already present, allowing reuse of string literals. Option A is false: String is immutable regardless of whether it is created with new or a literal. Option B is false: String does not implement Cloneable; it implements Serializable, Comparable, and CharSequence. Option D is false: methods like toUpperCase() return a new String object and do not modify the original.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
String is mutable if created with new.
Why it's wrong here
All Strings are immutable.
- ✗
String implements the Cloneable interface.
Why it's wrong here
String does not implement Cloneable.
- ✓
Strings are immutable.
Why this is correct
Once created, cannot change.
- ✗
String objects can be modified using methods like toUpperCase().
Why it's wrong here
toUpperCase() returns new String, does not modify original.
- ✓
The intern() method can add a string to the string pool.
Why this is correct
intern() returns canonical representation.
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Last reviewed: Jun 23, 2026
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