Quick Answer
The correct answer includes `translateEscapes()`, `toLowerCase(Locale)`, and `transform(Function<String, String>)` as the three valid String methods in Java 17. These methods are all officially part of the `java.lang.String` class, though they were added in different Java versions: `translateEscapes()` arrived in Java 14 to convert escape sequences like `\n` into actual newline characters, `toLowerCase(Locale)` is a long-standing overloaded method that respects locale-specific case rules, and `transform()` was introduced in Java 12 to apply a function to the string and return the result. On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, this question tests your familiarity with both legacy and modern String APIs, often appearing as a multiple-select trap where candidates confuse methods from other classes like `StringBuilder` or `Character`. A common pitfall is assuming `translateEscapes()` is a static method or that `transform()` requires a specific functional interface type—remember it accepts any `Function<? super String, ? extends R>`. For a quick memory aid, think “TTL” for **T**ranslateEscapes, **T**ransform, and **L**ocale-based toLowerCase.
This 1Z0-829 practice question tests your understanding of handling date, time, text, numeric and boolean values. 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 three of the following are valid methods in the String class in Java 17? (Choose three.)
substring(int, int, Locale)
Why wrong: Incorrect: No such overload; substring only takes start and end indices.
translateEscapes()
Correct: translateEscapes was added in Java 14.
toLowerCase(Locale)
Correct: toLowerCase(Locale) is a valid overload.
transform(Function<String, String>)
Correct: transform method was added in Java 12.
indent(String)
Why wrong: Incorrect: There is indent(int) but not indent(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
translateEscapes()
Option B is correct because `translateEscapes()` is a valid instance method introduced in Java 14 (and present in Java 17) that translates escape sequences (e.g., `\n` to newline) in a string. Option C is correct because `toLowerCase(Locale)` is a standard overloaded method in the String class that converts all characters to lowercase using the specified locale. Option D is correct because `transform(Function<String, String>)` is a valid method added in Java 12 that applies the given function to the string and returns the result.
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.
substring(int, int, Locale)
Why it's wrong here
Incorrect: No such overload; substring only takes start and end indices.
translateEscapes()
Why this is correct
Correct: translateEscapes was added in Java 14.
Related concept
Read the scenario before looking for a memorised answer.
toLowerCase(Locale)
Why this is correct
Correct: toLowerCase(Locale) is a valid overload.
Related concept
Read the scenario before looking for a memorised answer.
transform(Function<String, String>)
Why this is correct
Correct: transform method was added in Java 12.
Related concept
Read the scenario before looking for a memorised answer.
indent(String)
Why it's wrong here
Incorrect: There is indent(int) but not indent(String).
Common exam traps
The trap here is that candidates may confuse the `substring` method with other locale-sensitive methods like `toLowerCase(Locale)` or incorrectly assume that `indent` accepts a `String` parameter because of its name, when in fact it takes an `int`.
Detailed technical explanation
The `translateEscapes()` method processes escape sequences like `\t`, `\n`, `\"`, and `\\` at runtime, converting them to their actual character representations, which is useful when reading escaped strings from configuration files or user input. The `transform` method is a generic functional interface method that allows chaining operations on strings, e.g., `str.transform(s -> s.trim()).transform(String::toUpperCase)`. The `indent` method adjusts the indentation of each line based on the integer value, adding or removing spaces, and also normalizes line terminators.
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 1Z0-829 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
Handling Date, Time, Text, Numeric and Boolean Values — This question tests Handling Date, Time, Text, Numeric and Boolean Values — Read the scenario before looking for a memorised answer..
The correct answer is: translateEscapes() — Option B is correct because `translateEscapes()` is a valid instance method introduced in Java 14 (and present in Java 17) that translates escape sequences (e.g., `\n` to newline) in a string. Option C is correct because `toLowerCase(Locale)` is a standard overloaded method in the String class that converts all characters to lowercase using the specified locale. Option D is correct because `transform(Function<String, String>)` is a valid method added in Java 12 that applies the given function to the string and returns the result.
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 25, 2026
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