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Lecture 21

Lecture 21. May 2, 2000. Exam 2 Post-Mortem. Average grade was 69.3 Median was 72, which means there were some very low scores that pulled down the average. There were 5 A’s, 6 B’s, 8 C’s, 5 D’s, and 8 F’s Answers to code questions on the web. Answers to short answers on your sheet. FMQs.

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Lecture 21

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  1. Lecture 21 May 2, 2000

  2. Exam 2 Post-Mortem • Average grade was 69.3 • Median was 72, which means there were some very low scores that pulled down the average. • There were 5 A’s, 6 B’s, 8 C’s, 5 D’s, and 8 F’s • Answers to code questions on the web. • Answers to short answers on your sheet.

  3. FMQs • Q 6: Remember, a subclass object is also a superclass object, but not vice-versa. • Update! I made a mistake on the answer key; the correct choice was E. (No wonder so many people missed it.) • Q 23: You can define an anonymous class anywhere, even inside a parameter list in a method call. • Q 25: An event object always gets passed to a callback method in Java. • A listener is an object has a callback method.

  4. Review: TextEdit.java • Read the file from disk into the TextArea. • User edits the TextArea in memory (RAM). • Write the file from the TextArea to the disk.

  5. Project: MP3 Tag Editor • Overview • Read an MP3 file from disk into memory. • User edits the tags in memory. • Write the MP3 file from memory to disk. • GUI Design Goals • Use appropriate Components. • Use layout managers so the user can change the size of the main window.

  6. MusicMatch Jukebox • Download free copy: • http://www.musicmatch.com • Can play MP3 music files. • Can generate MP3 music files from audio CDs. • Maintains a “library” of your MP3 music files. • Provides an editor for your library. • There are other MP3 programs available, such as winamp, realaudio jukebox, etc.

  7. MP3 File Structure ID3V2 Tag (optional) Audio Information ID3V1 Tag (optional)

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