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Java 8 면접 질문과 답변

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Ques 21. Provide some examples of Terminal operations.

Example of Terminal operations are:
  • forEach
  • toArray
  • reduce
  • collect
  • min
  • max
  • count
  • anyMatch
  • allMatch
  • noneMatch
  • findFirst
  • findAny

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Ques 22. Given the list of numbers, remove the duplicate elements from the list.

See the following code:

Integer[] arr=new Integer[]{1,2,3,4,3,2,4,2};
List<Integer> listWithDuplicates = Arrays.asList(arr);
Set<Integer> setWithoutDups = listWithDuplicates.stream().collect(Collectors.toSet());
setWithoutDups.forEach((i)->System.out.print(" "+i));

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Ques 23. Difference between Stream findFirst() and findAny().

  • findFirst will always return the first element from the stream whereas findAny is allowed to choose any element from the stream.
  • findFirst has deterministic behavior whereas findAny is nondeterministic behavior.

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Ques 24. What is consumer function interface?

It is a functional interface defined in java.util.function package. It contains an abstract accept() and a default andThen() method. It can be used as the assignment target for a lambda expression or method reference.
Consumer is single argument functional interface which does not return any value.

public static void main(String[] args) {  
   Consumer<String> consumerString = s->System.out.println(s);
   consumerString.accept("John");
}
 
We have created consumer object which takes String object as input and print it. It is simple use of Consumer interface to print String.
Output:
John

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Ques 25. What is predicate function interface?

Predicate is single argument function which returns true or false. It has test method which returns boolean. Usually, it used to apply in a filter for a collection of objects.

public static void main(String[] args) {
Predicate<Integer> predicate = i -> i > 100;
boolean greaterCheck = predicate.test(200);
System.out.println("is 200 greater than 100: "+greaterCheck);
}

Output:
is 200 greater than 100: true

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