Given: public class Test { public static void main(String[] args) { List elements = Arrays.asList("car", "truck", "car", "bicycle", "car", "truck", "motorcycle"); Map outcome = elements.stream().collect(Collectors.groupingBy(Function.identity(), Collectors.counting() ) ); System.out.println(outcome); } } What is the result?

A. Bicycle=7, car=7, motorcycle=7, truck=7)

B. 3:bicycle, 0:car, 0motorcycle, 5:truck)

C. Bicycle, car, motorcycle, truck)

D. Bicycle=1, car=3, motorcycle=1, truck=2)

Oracle

1Z0-829 · Question #27

Given: public class Test { public static void main(String[] args) { List<String> elements = Arrays.asList("car", "truck", "car", "bicycle", "car", "truck", "motorcycle"); Map<String, Long> outcome =…

The correct answer is E. Compilation fails. Option E is correct because the code is missing all required import statements - java.util.List, java.util.Arrays, java.util.Map, java.util.stream.Collectors, and java.util.function.Function are not in java.lang and are never auto-imported, so the compiler cannot resolve any of…

Working with Streams and Lambda expressions

Question

Given:
public class Test {
public static void main(String[] args) {
List<String> elements =
Arrays.asList("car", "truck", "car",
"bicycle", "car", "truck", "motorcycle");
Map<String, Long> outcome =
elements.stream().collect(Collectors.groupingBy(Function.identity(), Collectors.counting() ) );
System.out.println(outcome);
}
}
What is the result?

Options

ABicycle=7, car=7, motorcycle=7, truck=7)
B3:bicycle, 0:car, 0motorcycle, 5:truck)
CBicycle, car, motorcycle, truck)
DBicycle=1, car=3, motorcycle=1, truck=2)
ECompilation fails.

How the community answered

(26 responses)

A
4% (1)
B
12% (3)
C
4% (1)
D
27% (7)
E
54% (14)

Explanation

Option E is correct because the code is missing all required import statements - java.util.List, java.util.Arrays, java.util.Map, java.util.stream.Collectors, and java.util.function.Function are not in java.lang and are never auto-imported, so the compiler cannot resolve any of these types. Options A, B, and C are nonsensical fabrications that don't reflect how groupingBy with counting() works. Option D has the correct counts (car=3, truck=2, bicycle=1, motorcycle=1) and would be the right output if the code compiled, but it's still wrong here because the code never reaches runtime. The memory tip: always scan for missing imports first - Java exam questions frequently hide compilation errors in code that looks logically correct; if you see collection/stream types with no import block, compilation fails before any logic runs.

Topics

#Collectors#groupingBy#Stream API#Functional interfaces

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