Arrays and ArrayLists

Consider the following code segment. Which of the following statements best describes the condition when it returns true? a is an integer array.

• whenever the first element in a is equal to val

• Whenever a contains any element which equals val

• Whenever the last element in a is equal to val

• Whenever more than 1 element in a is equal to val

• Whenever exactly 1 element in a is equal to val

Look at the following code segment. Which of the following arrays would return true when val = 4? Select all that apply.

• a = {4, 3, 2, 1};

• a = {1, 2, 3, 4};

• a = {1, 2, 3, 4, 3, 2, 1};

• a = {4, 4, 2, 2};

• a = {2, 2, 2, 4};

Look at the following code. What would findLargest(10) return?

• 2

• 3

• 5

• 7

• 13

Consider the following field arr and method checkArray. Which of the following best describes what checkArray returns?

• Returns the index of the largest value in array arr.

• Returns the index of the first element in array arr whose value is greater than arr[loc].

• Returns the index of the last element in array arr whose value is greater than arr[loc].

• Returns the largest value in array arr.

• Returns the index of the largest value in the second half of array arr.

Given the following field and method declaration, what is the value in a[1] after m1(a) has run?

• 4

• 2

• 12

• 6

• 3

Given the following code, what does m1(a) return?

• 4

• 2

• 12

• 6

• 3

Consider the following method changeArray. An array is created that contains {2, 8, 10, 9, 6} and is passed to changeArray. What are the contents of the array after the changeArray method executes?

• {2, 6, 2, -1, -3}

• {-23, -21, -13, -3, 6}

• {10, 18, 19, 15, 6}

• This method results in an IndexOutOfBounds exception.

• {35, 33, 25, 15, 6}

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

• nums.length

• nums.length - 1

• nums.length()

• nums.size()

• nums.size() - 1

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

• An ArrayList can grow or shrink as needed, while an array is always the same size.

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

• You can store objects in an ArrayList, but not in an array.

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

• nums[0]

• nums[1]

• nums.first()

• nums.get(1)

• nums.get(0)