CMIS 234 Exam 3 Flashcards

Questions and Answers

Since the sort() method of the Arrays class can sort String objects, what must be true of the String class?

It implements the Comparable interface. (correct)

It inherits a sort() method.

It implements the comparable() method.

It contains a sort() method.

An enhanced for loop can only be used...

To work with jagged arrays

To work with all the elements of an array (correct)

To work with one-dimensional arrays

To work with arrays that contain integers

What numbers does the code that follows print to the console? int[] numbers = {1, 2, 3, 4, 5, 6, 7, 8, 9}; for (int i = 0; i < 9; i++) { System.out.println(numbers[i]); }

0-9

1-9 (correct)

1-8

0-8

What happens when the code that follows is executed? int[] nums = new int;

<p>This code will cause a compilation error due to incorrect array initialization.</p> Signup and view all the answers

Study Notes

Sorting and String Class

The sort() method in the Arrays class sorts String objects because the String class implements the Comparable interface.
Implementing Comparable allows an object to be compared with another, enabling standard sorting mechanisms.

Enhanced For Loops

Enhanced for loops facilitate iteration through all elements of an array, not limited to specific types or dimensions.
This loop simplifies access to elements in arrays, making the code cleaner and often less error-prone.

Console Output of Array

Given the array int[] numbers = {1, 2, 3, 4, 5, 6, 7, 8, 9};, a loop that prints elements with System.out.println(numbers[i]); outputs numbers from 1 to 9.
The loop's index begins at 0 but only goes up to 8, returning values from the array starting with the first element (1) and ending with the last (9).

Executing Array Initialization

The line int[] nums = new int; is syntactically incorrect because it omits array size initialization; arrays must be defined with a specific length.
Attempting to execute this code will likely result in a compilation error due to improper syntax.

Description

Test your knowledge with these flashcards for CMIS 234 Exam 3. Each card focuses on important Java concepts, such as sorting and enhanced for loops. Perfect for students preparing for their exam and wanting to reinforce their understanding of Java programming.