Arrays

Question 1

Two ways to declare and create a one-dimensional array:

Answer 1

SomeType[] a = new SomeType[size]
SomeType[] b = {value0, value1, value2, value3, …, value(n-1) }

EXAMPLES:
double[] samples = new double[100]
int[] numbers = {1, 2, 3}

Question 2

Once an array is created, its ______ cannot be changed

Answer 2

size

Question 3

The only way to expand an array is:

Answer 3

create a bigger array and copy the contents of the original array into the new one.

Question 4

If the limits on an array’s size are too large in a loop:

Answer 4

an ArrayIndexOutOfBoundsException is thrown. This is a run-time error, NOT a compile-time error.

Question 5

To declare two dimensional arrays:

Answer 5

double[][] matrix = new double[3][5] (3 rows by 5 cols)

int r, c;
matrix[r][c] = 1.23

Question 6

If m is a two-dimensional array, m.length represents the number of ______ and m[0].length represents the number of _____

Answer 6

rows, columns

Question 7

An array list is defined, with the desired type of its objects “student” as:

Answer 7

ArrayList list = new ArrayList

Question 8

An ArrayList cannot hold values of a ______ data type

Answer 8

primitive. for example, the object is not allowed to be String, int, or double, but ints and doubles can be added to an ArrayList or ArrayList respectively, due to auto boxing