AP CS A: Arrays, Array Lists, Recursion & Searching/Sorting

Which index is the last element in an array called nums at?

• nums.length

• nums.length - 1

Which of the following declarations will cause a compile time error?

• int[] scores = null;

• int[] scoreArray = {50,90,85};

• String[] nameArray = new String[10];

• String[] nameArray = {5, 3, 2};

• int[] scores = new int[5];

What is returned from arr[3] if arr={6, 3, 1, 2}?

• 1

• 2

• 3

• 6

• 4

What is returned from mystery when it is passed {10, 30, 30, 60}?

• 17.5

• 30.0

• 130

• 32

• 32.5

Given the following values of a and the method doubleLast what will the values of a be after you execute: doubleLast()?

• {-20, -10, 2, 8, 16, 60}

• {-20, -10, 2, 4, 8, 30}

• {-10, -5, 1, 8, 16, 60}

• {-10, -5, 1, 4, 8, 30}

Which of the following statements is a valid conclusion. Assume that variable b is an array of k integers and that the following is true:

• The value in b[0] does not occur anywhere else in the array

• Array b is sorted

• Array b is not sorted

• Array b contains no duplicates

• The value in b[0] is the smallest value in the array

Consider the following code segment. Which of the following statements best describes the condition when it returns true?

• 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

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

• 4

• 2

• 12

• 6

• 3

Consider the following code. What is the maximum amount of times that HELLO could possibly be printed?

• k - 1

• k + 1

• k

• 1

• 0

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}