1Z0-829 Working with Arrays and Collections Practice Question
Exhibit
Refer to the exhibit.
List<String> list = new ArrayList<>();
list.add("A");
List<?> list2 = list;
list2.add("B");
System.out.println(list2);What is the result of attempting to compile and run the following code? ```java
import java.util.*;
List<String> list = Arrays.asList("A", "B"); list.removeIf(s -> s.startsWith("A")); System.out.println(list); ```
⚠ Common exam trap
A common mistake is to focus on the lambda syntax and assume the code compiles and runs, outputting [B]. However, Arrays.asList returns a fixed-size list, so removeIf throws UnsupportedOperationException at runtime.
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
✓
Runtime exception
The code compiles successfully because `removeIf` is a default method in `Collection` and the predicate is a valid lambda. However, `Arrays.asList` returns a fixed-size list backed by the array, and `removeIf` attempts to modify the list structurally, which throws `UnsupportedOperationException` at runtime. Therefore, the correct answer is E: Runtime exception.
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]
Why it's wrong here
Incorrect. The list is modified but an exception occurs before any output.
- ✗
[A]
Why it's wrong here
Incorrect. The list is modified but an exception occurs before any output.
- ✗
[B]
Why it's wrong here
Incorrect. The list is modified but an exception occurs before any output.
- ✗
Compilation fails
Why it's wrong here
Incorrect. The code compiles without errors.
- ✓
Runtime exception
Why this is correct
Correct. `Arrays.asList` returns a fixed-size list; calling `removeIf` throws `UnsupportedOperationException`.
Quick reference
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