Select an appropriate expression to complete the following method, which is designed to return the number of elements in the parameter array numbers.  If a value appears more than once, it should be counted exactly once. public static int countElementsOnce(int[] numbers) { Set values = new HashSet(); for (int num: numbers) { values.add(num); } ______________________ }

Assume inputFile is a Scanner object used to read data from a text file that contains a number of lines.  Some lines contain an alphabetic string, while others contain a single integer value.  Select an expression to complete the following code segment, which counts the number of integer values in the input file. int count = 0; while (inputFile.hasNextLine()) { if (________________________________) { count++; } inputFile.nextLine(); } System.out.println(count);

Assume that names is an array of String objects that has been initialized with a large number of elements.  Select the statement that would sort the elements in names in ascending alphabetic order.

What is known for certain from this correct code excerpt? ActionListener openListener = new FileOpenListener(); JMenuItem fileOpen = new JMenuItem(“Open File”); fileOpen.addActionListener(openListener);

Insert the missing code in the following code fragment. This fragment is intended to read a web page. public static void main(String[] args) throws IOException { String address = “http://horstmann.com/index.html”; URL pageLocation = new URL(address); Scanner in = _________; . . . }

In a _____________, a set of cooperating methods calls each other repeatedly.

Insert the missing code in the following code fragment. This fragment is intended to read a web page. public static void main(String[] args) throws IOException { String address = “http://horstmann.com/index.html”; URL pageLocation = new URL(address); Scanner in = _________; . . . }

In a _____________, a set of cooperating methods calls each other repeatedly.

What reserved word in a class definition ensures that subclasses cannot be created from the class?

What reserved word in a class definition ensures that subclasses cannot be created from the class?