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Object-oriented language basics, Part 6
Use interfaces for safe multiple inheritance and a great deal more
Page 6 of 7
Review
Interfaces make it possible to introduce types into source code without fixing those types to a specific implementation. In this article, you learned how to declare and extend interfaces. You then examined the usefulness of empty interfaces. In addition, you learned how to implement interfaces and why multiple interface inheritance is safe. Finally, you witnessed the power of the interface.
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More from JavaWorld
Resources
- "Object-Oriented Language Basics," Jeff Friesen (JavaWorld):
- Part 1Learn how to declare classes and create objects (April 2001)
- Part 2Declare and access fields and methods (May 2001)
- Part 3CompositionBuild objects from other objects (June 2001)
- Part 4InheritanceBuild objects in layers (July 2001)
- Part 5The root of all classes (August 2001)
- Part 6Use interfaces for safe multiple inheritance and a great deal more (September 2001)
- Part 7Learn about Java's many shapes and find out how to accommodate generalities in your class hierarchies (October 2001)
- For a glossary specific to this article, homework, and more, see the Java 101 study guide that accompanies this article
http://www.javaworld.com/javaworld/jw-09-2001/jw-0907-java101guide.html - Download this article's source code and resource files
http://www.javaworld.com/javaworld/jw-09-2001/java101/jw-0907-java101.zip - The Java Language Specification, Second Edition, James Gosling, Bill Joy, Guy Steele, Gilad Bracha (Sun Microsystems, 2000)
http://www.javasoft.com/docs/books/jls/second_edition/html/j.title.doc.html - The Java Tutorial
http://www.javasoft.com/tutorial/ - The Javadoc Tips FAQ
http://java.sun.com/j2se/javadoc/faq.html - Javadoc 1.3 Documentation
http://java.sun.com/j2se/1.3/docs/tooldocs/javadoc/index.html - Sun's official Java language definition
http://java.sun.com/docs/overviews/java/java-overview-1.html - "A Primordial Interface?" Wm. Paul Rogers (JavaWorld, March 2001) -- Java's Object class is the root of all classes. Does Java have a similar root interface?
http://www.javaworld.com/javaworld/jw-03-2001/jw-0309-primordial.html - "Constants, I Do Declare," Tony Sintes (JavaWorld, June 2001) -- Some developers feel that constants should not be declared in interfaces
http://www.javaworld.com/javaworld/javaqa/2001-06/01-qa-0608-constants.html - "Java Diamonds Are Forever," Tony Sintes (JavaWorld, March 2001) -- How does Java use interfaces to solve the famous diamond problem?
http://www.javaworld.com/javaworld/javaqa/2001-03/02-qa-0323-diamond.html - "Java Tip 10Implement Callback Routines in Java," John D. Mitchell (JavaWorld) -- You can use interfaces to implement the equivalent of callback functions in Java
http://www.javaworld.com/javaworld/javatips/jw-javatip10.html - Check out past Java 101 articles
http://www.javaworld.com/columns/jw-101-index.shtml - Java experts answer your toughest Java questions in JavaWorld's Java Q&A column
http://www.javaworld.com/javaworld/javaqa/javaqa-index.html - For more articles on Object-Oriented Design and Programming, browse our Topical Index
http://www.javaworld.com/channel_content/jw-oop-index.shtml - For Tips 'N' Tricks see
http://www.javaworld.com/javaworld/javatips/jw-javatips.index.html - Sign up for the JavaWorld 's free weekly email newsletters
http://www.idg.net/jw-subscribe - You'll find a wealth of IT-related articles from our sister publications at IDG.net
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