W6_PASS(W5)_Quiz

Which type of loop is best known for its boolean condition that controls entry to the loop?

• do-while

• while

• for

• for-each

Which of the following can iterate through an array without referring to the elements by index?

• do-while

• while

• for

• for-each

Which is not a true statement about an array?

• An array is allowed to contain duplicate values.

• An array uses a zero index to reference the first element.

• An array expands automatically when it is full.

• None of the above.

How do you determine the number of elements in an array? Example: int books[] = new int[5];

• books.length

• books.size

• books.length()

• books.size()

How do you determine the number of elements in an ArrayList? Example: ArrayList<String> listOfBooks = new ArrayList <String>();

• listOfBooks.length

• listOfBooks.size

• listOfBooks.length()

• listOfBooks.size()

Which of the following is the correct way to get the first value in a list called books?

• books[0]

• books[1]

• books.get(0)

• books.get(1)

How many of them are legal declarations?

• None

• One

• Two

• Three

What is the possible output of the following code?

• [null, null]

• []

• [Ljava.lang.String;@6e171cd7

• None of the above

Which of the following provides key-value pair?

• List

• Set

• Map

• None of the above

Which of the following is/are considered variable-size collections?

• Array

• ArrayList

• HashMap

• None of the above