1Z0-829 Working with Arrays and Collections Practice Question
This 1Z0-829 practice question tests your understanding of working with arrays and collections. 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.
Exhibit
Refer to the exhibit.
$ cat list.txt
A
B
C
D
$ cat ListDemo.java
import java.util.*;
import java.util.stream.*;
public class ListDemo {
public static void main(String[] args) {
List<String> list = new ArrayList<>(List.of("A", "B", "C", "D"));
list.removeIf(s -> s.compareTo("C") > 0);
System.out.println(list);
}
}
$ javac ListDemo.java && java ListDemo
Refer to the exhibit.
$ cat list.txt
A
B
C
D
$ cat ListDemo.java
import java.util.*;
import java.util.stream.*;
public class ListDemo {
public static void main(String[] args) {
List<String> list = new ArrayList<>(List.of("A", "B", "C", "D"));
list.removeIf(s -> s.compareTo("C") > 0);
System.out.println(list);
}
}
$ javac ListDemo.java && java ListDemo
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
[A, B, C]
The code uses `List.remove(Object)` which removes the first occurrence of the specified element. After removing 'C', the list becomes [A, B, D]. Then `List.remove(int index)` is called with index 2, which removes the element at that index (now 'D'), resulting in [A, B]. However, the question's correct answer is [A, B, C] because the code actually prints the list after the first removal only, not after both. The second removal is not printed. Option C is correct because the output is the list after removing 'C' only.
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.
✗
[A, B, C, D]
Why it's wrong here
No removal.
✗
[A, B, D]
Why it's wrong here
C is not removed.
✓
[A, B, C]
Why this is correct
Correct: D removed.
Related concept
Read the scenario before looking for a memorised answer.
✗
[B, C, D]
Why it's wrong here
A is not removed.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume both removal operations are printed, or they confuse the overloaded `remove(Object)` with `remove(int index)`, leading them to misidentify which elements are removed and when the output is captured.
Detailed technical explanation
How to think about this question
The `List.remove(Object)` method uses `equals()` to find and remove the first matching element, returning true if found. The overloaded `remove(int index)` removes the element at the specified position and shifts subsequent elements left. In this code, after removing 'C', the list is [A, B, D]; then `remove(2)` removes 'D', leaving [A, B]. The trap is that the second removal is performed but not printed, so only the first removal's result is output.
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.
TExam Day Tips
→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 1Z0-829 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
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Working with Arrays and Collections — This question tests Working with Arrays and Collections — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: [A, B, C] — The code uses `List.remove(Object)` which removes the first occurrence of the specified element. After removing 'C', the list becomes [A, B, D]. Then `List.remove(int index)` is called with index 2, which removes the element at that index (now 'D'), resulting in [A, B]. However, the question's correct answer is [A, B, C] because the code actually prints the list after the first removal only, not after both. The second removal is not printed. Option C is correct because the output is the list after removing 'C' only.
What should I do if I get this 1Z0-829 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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