UCLA  -   PIC 20A

• Abstract classes  vs.  Interfaces (differences and similarities)
• How are Java Interface objects different from classes, in general?
• What is a package, why do we need it and how do we use it?
• What are exceptions and call-stacks?
• Data structures:  Stack (LIFO), queue (FIFO), linked-list.
• What is the catch-or-specify requirement in exception handling?
• What is the rationalle for throwing exceptions from one method/class to another in the call-stack framework?
• What's the proper order in catching exceptions?
• State the basic advantages of using exceptions. Can exceptions be used for non-exceptional flow of control redirection? Should they be used this way?
• What is a thread?
• What are the two ways for defining a run method for a thread. How do we decide which approach to take?
• Is the highest priority thread the one always running on the CPU?
• What are the divisions of the I/O stream classes? Which is the most common type of a stream programs use? Why?
• What is object serialization?
• What is required for a Java event handler to work properly?

• Define an interface Shape and include a couple of members of types that make sense for this interface (constants, variables?, methods).
• What is the general format for defining and implementing an interface? Can interfaces be instantiated? Can an interface be used as a reference type in function calls?
• Give a simple example of constructing and importing a package
• What is the general form for the exception handling mechanism in Java?
• Give some general (heuristic) examples of where using threads may be very beneficial
• Give an example of creating, starting and terminating a thread in an Applet class
• Show an example of creating a group of threads. Why is this useful?
• Write a simple file I/O stream that copies the content of one file into another
• Construct a JButton object, instantiated it and provide an action handler that prints button clicked, upon click
• Which of the following is not an event listener; ActionListener, WindowListener, MouseListener, MouseMotionListener, IOListener, ComponentListener, FocusListener, ListSelectionListener?
• List 10 Java Swing components frequently used as widgets added in Java GUIs
• List the basic layout managers

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