Unit 7 - ArrayList - Test Review

In what scenario would you use an ArrayList over an array?

• I don’t have a lot of memory to store information

• I can use a for-each loop on an ArrayList, but not in an array

• I need to change the size of an array

• I can store objects in an ArrayList, but not in an array

Which index is the last element at in a list called nums?

• nums.length

• nums.length - 1

• nums.size()

• nums.size() - 1

Which of the following is a reason to use an array instead of an ArrayList?

• An array has faster access to its elements than a list does

• An array knows it length, but an ArrayList doesn't know its length

• An array can determine how many spaces it needs before declaring elements into the array

Which of the following is the correct way to get the first value in an ArrayList called nums?

• nums[0]

• nums[1]

• nums.first()

• nums.get(0)

• nums.get(1)

Which of the following is the correct way to remove the value 3 from the ArrayList nums = [5, 3, 2, 1]?

• nums.remove(3);

• nums.remove(0);

• nums.remove(1);

• nums.remove(2);

What would the proper initialization and declaration be for an ArrayList myCart meant to store item prices?

• ArrayList<double> myCart = new ArrayList<double>();

• ArrayList<Double> myCart = new ArrayList<Double>();

• ArrayList<Integer> myCart = new ArrayList<Integer>();

• ArrayList<double> myCart = ArrayList<double>();

• ArrayList<Double> myCart = ArrayList<Double>();

• [SO, RE, FA, DO]

• [SO, RE, MI, FA, DO]

• [SO, RE, MI, DO]

• [FA, RE, MI, DO]

• [FA, SO, RE, MI, DO]

• 1

• 4

• 6

• 3

• out of bounds error.

  there is no element at index 4

• [ E, D, A, B ]

• [ D, A, B, E ]

• [ A, B, D, E ]

• [ E, D, C, B ]

Given the following code and assume that nums initially contains [0, 0, 4, 2, 5, 0, 3], what will nums contain as a result of executing numQuest?

• [0, 4, 2, 5, 3]

• [3, 5, 2, 4, 0, 0, 0]

• [0, 0, 0, 4, 2, 5, 3]

• [4, 2, 5, 3]

• [0, 0, 4, 2, 5, 0, 3]