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Object-oriented language basics, Part 5
The root of all classes
Page 4 of 6
first second s == t: false true 10 20 30
As you can see, Java automatically completes everything required to duplicate an array. No fuss, no muss! However, arrays
are shallowly cloned. That is why s [0] and t [0] refer to the same String object. To properly duplicate the objects referenced by the String array's elements, you must use deep cloning. And how do you do that? I've left you that task as a homework exercise.
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- Download this article's source code and resource files
http://www.javaworld.com/javaworld/jw-08-2001/java101/jw-0803-java101.zip - "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-08-2001/jw-0803-java101guide.html - 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 - 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
http://www.javaworld.com/javaworld/javaqa/javaqa-index.html - For Tips 'N' Tricks see
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