JAVA Quiz 4

How are lambda expressions denoted in Java?

• A. =>
  

• B. ->
  

• C. <>
  

• D. ::

In the context of Java 8 lambda expressions, what is a target type?

• A. The type of the lambda expression
  

• B. The type of the functional interface
  

• C. The type of the argument
  

• D. The return type of the lambda expression

What is the purpose of the Predicate functional interface in Java 8?

• A. To produce results
  

• B. To consume values
  

• C. To transform values

• D. To filter elements based on a condition
  

Q. Which of the following represents a Lambda Expression in Java?

• A.

  (int a, int b) -> a + b

• B.

  public int add(int a, int b) { return a + b; }

• C.

  (a, b) => a + b

• D.

  int sum = (x, y) -> x + y;

Which of these classes is not part of Java’s collection framework?

• a) Array
  

• b) Maps
  

• c) Stack
  

• d) Queue

What is Collection in Java?

• a) A group of classes
  

• b) A group of
  objects

• 
  c) A group of interfaces
  

• 
  d) None of the mentioned

What will be the output of the following-

• a) 12885
  

• 
  b) 58881
  

• c) 12845

• d) 54881

Which of these packages contain all the collection classes?

• a) java.lang
  

• b) java.util
  

• c) java.net
  

• d) None of these

What will be the result of invoking remove(0) on an empty LinkedList object?

• a) NullPointerException

• b) IndexOutOfBoundsException

• c) UnsupportedOperationException

• d) The method will simply return without any exception

What is the behavior of the add() method in a Set collection?

• a) It adds the element and returns true

• b) It adds the element if it is not already present in the set

• c) It replaces the existing element if it is already present

• d) It throws an exception if the element is already present