• None

• I only

• I and II

• II only

• In a strategy design pattern, the desired algorithm is specified and invoked via a(n)

  • strategy interface

  • algorithm class

  • singleton class

  • context class

• What kinds of abstract classes, if any, can be instantiated?

  • Those that contain only abstract methods

  • Those that contain no abstract methods

  • Those that contain at least one method that is not abstract

  • None

• In Java, for a subclass of an abstract class not to be abstract, the subclass must override which of the following?

• All inherited abstract methods

• All inherited methods that are not abstract

• I and II

• II only

• None

• I only

• Consider the following line of Java code.

PrintWriter fileOut =

new PrintWriter(new FileWriter("out.txt", true));

Which of the following is (are) true about the result of executing the line of code?

• If the file out.txt exists, its contents will be erased.

• If the file out.txt does not exist, it will be created.

• I and II

• None

• I only

• II only

• Which of the following is (are) true regarding file input in Java?

• FileReader and BufferedReader are defined in the package java.lang.

• A BufferedReader object can receive data from a FileReader object.

• A BufferedReader object can read entire lines of data.

• I, II, and III

• I and III only

• I and II only

• II and III only

• In Java, which of the following registers a listener for a radio button click event?

  • actionPerformed

  • ActionEvent

  • addEventListener

  • addActionListener

• Which of the following is a line of code that registers a named inner class as an event listener for a JList object in Java?

  • addListSelectionListener(this);

  • addActionListener(new ListListener());

  • addActionListener(this);

  • addListSelectionListener(new ListListener());

• In Java, which of the following is (are) true regarding JTextArea objects?

• They support background and foreground colors.

• They have built-in scrollbar capability.

• They can be read-only.

• I and II only

• II and III only

• I, II, and III

• I and III only

• Which of the following is (are) true regarding event handling in Java?

• A single listener object can be registered to handle all button presses in an application.

• A different listener object can be registered with each button in an application.

• I only

• II only

• None

• I and II

• In Java, which of the following terminates a program?

  • windowClosing()

  • actionPerformed()

  • dispose()

  • System.exit(0)

• A user clicking a JButton component in Java generates which of the following events?

• Action

• Mouse pressed

• Mouse clicked

• I only

• I and II only

• II and III only

• I, II, and III

• Which of the following is a Java layout manager that automatically wraps components to the next available row if they cannot fit on the current row?

  • BorderLayout

  • GridLayout

  • GridBagLayout

  • FlowLayout