Chapter 2-1: Array Part 1

What is an array?

• A collection of variables of the same type stored in contiguous memory locations.

• A collection of variables of different types stored in non-contiguous memory locations.

• A collection of functions.

• A type of loop structure.

Which of the following correctly declares an array in Java?

• int array;

• int array[10];

• int[] array = new int[10];

• array array[10];

What is the index of the first element in an array?

• -1

• 0

• 1

• The index is undefined

How do you access the third element in an array named arr in Java?

• arr[3];

• arr(3);

• arr[2];

• arr{3};

Which of the following statements correctly initializes an array of 5 integers to zero?

• int[] arr = {0, 0, 0, 0, 0};

• int[] arr = (0, 0, 0, 0, 0);

• int[] arr = [0, 0, 0, 0, 0];

• int[] arr = new int[5];

What is a multi-dimensional array?

• An array with only one dimension.

• An array that can store values of different types.

• An array with more than one dimension, such as a 2D array.

• An array that uses pointers.

How do you declare a two-dimensional array in Java?

• int arr[2];

• int[][] arr = new int[2][3];

• int arr{2,3};

• int arr(2,3);

What is the output of the following code?

int[] arr = {1, 2, 3};

System.out.println(arr[1]);

• 1

• 2

• 3

• Error

How do you store the value 10 in the third element of an array named arr?

• arr[3] = 10;

• arr[2] = 10;

• arr(3) = 10;

• arr{2} = 10;

Which of the following is TRUE about array size in Java?

• The size of an array is always fixed after its declaration.

• The size of an array can be changed after its declaration.

• Arrays do not have a size limit.

• The size of an array is defined during the runtime.