- A
Use BigDecimal to represent the value and then convert to int using intValue().
Why wrong: BigDecimal handles decimal precision but still requires cleaning the string; intValue() truncates, which may cause data loss, and does not address the formatting.
- B
Use a custom parser that throws a checked exception to enforce proper formatting.
Why wrong: Creating a custom parser is overkill and does not solve the immediate problem of converting already formatted strings; it would reject valid data instead of cleaning it.
- C
Use a Scanner with useDelimiter("[^0-9]") to extract digits.
Why wrong: The Scanner approach is for tokenizing input, not for cleaning a single string; it would require extra iteration and is less straightforward.
- D
Use String.replaceAll("[^0-9]", "") to remove non-digit characters before parsing.
This removes all non-digit characters, leaving a clean integer string that Integer.parseInt can handle correctly.
Quick Answer
The correct approach is to use `String.replaceAll("[^0-9]", "")` to strip all non-digit characters before parsing. This works because `NumberFormatException` when parsing strings in Java occurs when the input contains characters like commas, currency symbols, or decimal points that `Integer.parseInt()` cannot interpret. By applying a regex that removes everything except digits 0–9, you clean the string into a pure numeric sequence—such as turning `"$5,000.00"` into `"500000"`—which the method can then safely convert to an integer representing the whole dollar amount. On the Oracle Java Foundations 1Z0-811 exam, this scenario tests your understanding of both exception handling and string manipulation, often appearing in questions about real-world data cleaning. A common trap is to catch the exception without fixing the root cause, which still leaves valid transactions unprocessed. Remember the mnemonic: “Scrub the symbols, then parse the digits.”
1Z0-811 Java Basics and Syntax Practice Question
This 1Z0-811 practice question tests your understanding of java basics and syntax. 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.
A developer is building a Java application for a bank that processes account transactions. The application reads transaction amounts from a CSV file provided by a third party. The amounts are in string format, e.g., '1,234.56' or '$5,000.00'. The developer uses Integer.parseInt() to convert these strings to integers for processing. However, many transactions fail with NumberFormatException. The developer adds a try-catch block to catch the exception and log the error. But still, the application fails to process valid transactions because the parsing does not handle the formatting. The development team is considering several approaches to fix this issue. The goal is to parse the string into an integer representing the whole dollar amount (ignoring cents and formatting). Which course of action should the developer take?
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
Use String.replaceAll("[^0-9]", "") to remove non-digit characters before parsing.
The best approach is to remove all non-digit characters before parsing. Using String.replaceAll("[^0-9]", "") strips commas, currency symbols, and decimal points, leaving only digits, which Integer.parseInt can handle. Option B is correct. Option A (Scanner) is cumbersome for a single string. Option C (BigDecimal) is overkill and still requires cleanup, plus intValue() loses precision. Option D is impractical for formatting issues.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use BigDecimal to represent the value and then convert to int using intValue().
Why it's wrong here
BigDecimal handles decimal precision but still requires cleaning the string; intValue() truncates, which may cause data loss, and does not address the formatting.
- ✗
Use a custom parser that throws a checked exception to enforce proper formatting.
Why it's wrong here
Creating a custom parser is overkill and does not solve the immediate problem of converting already formatted strings; it would reject valid data instead of cleaning it.
- ✗
Use a Scanner with useDelimiter("[^0-9]") to extract digits.
Why it's wrong here
The Scanner approach is for tokenizing input, not for cleaning a single string; it would require extra iteration and is less straightforward.
- ✓
Use String.replaceAll("[^0-9]", "") to remove non-digit characters before parsing.
Why this is correct
This removes all non-digit characters, leaving a clean integer string that Integer.parseInt can handle correctly.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this 1Z0-811 question test?
Java Basics and Syntax — This question tests Java Basics and Syntax — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use String.replaceAll("[^0-9]", "") to remove non-digit characters before parsing. — The best approach is to remove all non-digit characters before parsing. Using String.replaceAll("[^0-9]", "") strips commas, currency symbols, and decimal points, leaving only digits, which Integer.parseInt can handle. Option B is correct. Option A (Scanner) is cumbersome for a single string. Option C (BigDecimal) is overkill and still requires cleanup, plus intValue() loses precision. Option D is impractical for formatting issues.
What should I do if I get this 1Z0-811 question wrong?
Identify which 1Z0-811 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 23, 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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