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Object-oriented language basics, Part 4
Inheritance: Build objects in layers
Page 4 of 10
Overriding methods
A subclass method can override, or replace, a superclass method if the subclass method has the same name, same return type, and same parameter list as its superclass counterpart. Consider the following code fragment:
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- "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)
- Download this article's source code and resource files
http://www.javaworld.com/javaworld/jw-07-2001/java101/jw-0706-java101.zip - 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-07-2001/jw-0706-java101guide.html - The Java Language Specification, Second Edition, James Gosling, Bill Joy, Guy Steele, and 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 - Check out past Java 101 articles
http://www.javaworld.com/javaworld/topicalindex/jw-ti-java101.html - For more articles geared toward the Java beginner, browse the Intro Level section of JavaWorld's Topical Index
http://www.javaworld.com/javaworld/topicalindex/jw-ti-introlevel.html - Java experts answer your toughest Java questions in JavaWorld's Java Q&A column
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