Quiz 15 - Array Basics

Which of the following types of data can be put into an array?

• int

• String

• JLabel

• all of the above

What is the correct way to create an array that holds 10 integers?

• int scores = new int [10];

• int scores = new int [9];

• int [] scores = new int [10];

• int [] scores = new int [9];

Which instruction will print the 7th element of the array "scores"?

• System.out.println(scores[7]);

• System.out.println(scores[6]);

• System.out.println(scores[8]);

• System.out.println(scores7);

Which instruction can be used to change the value at index 4 of the array "scores"?

• scores_4 = 14728;

• scores[5] = 14728;

• scores[3] = 14728;

• scores[4] = 14728;

Which statement can be used to create an array that holds the names of the days of the week?

• String [] dayNames = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

• String [] dayNames = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];

• String dayNames = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

• String dayNames = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];

In Java, you can change multiple array elements at once.

• True

• False

int [] scores = new int [10];

What values will initially be stored in the array elements of "scores"?

• 0

• nothing

• a random value

• 1

JButton [] scores = new JButton [10];

What values will initially be stored in the array elements of "scores"?

• 0

• nothing

• a button with no text or image

• null

Which instruction could be used to increase the value of the 5th element of array "scores"?

• scores[4]++;

• scores[4] = scores[4] + 1;

• scores[4] += 1;

• any of the above

scores[7]

What do we call the number in the square brackets above?

• order

• subscript

• element

• value