AP CSA Arrays and ArrayLists 3

Question 1

What happens if you try to store a double value in an int array in Java?

Accepted Answer

Compile-time error

Answer

Runtime error

Answer

The value is automatically truncated

Answer

The array resizes

Question 2

How do you get the number of rows in a 2D array called `matrix`?

Accepted Answer

matrix.length

Answer

matrix[0].length

Answer

matrix.size()

Answer

matrix.rows

Question 3

Which ArrayList method removes the first occurrence of a specified object?

Accepted Answer

remove(Object o)

Answer

delete(Object o)

Answer

removeFirst(Object o)

Answer

erase(Object o)

Question 4

What is traversing a 2D array row by row called?

Accepted Answer

Row-major order traversal

Answer

Column-major order traversal

Answer

Diagonal traversal

Answer

Spiral traversal

Question 5

What is the default value of elements in a newly created `int[]` array?

Accepted Answer

0

Answer

null

Answer

1

Answer

-1

Question 6

Which of the following correctly converts an ArrayList<Integer> to an array?

Accepted Answer

list.toArray(new Integer[0])

Answer

list.toArray()

Answer

Arrays.toArray(list)

Answer

list.asArray()