Re: Java-Specific Question
David, >Here's a Java question. Let's say that I have a class with a method > > public void parse (String publicId, String systemId, Reader reader) > throws java.lang.Exception; > >What will happen if the "java.io.Reader" class is not available on my >system (perhaps because I'm using a 1.0.2 browser), but I never invoke >this method (I'm assuming that I compiled my code under JDK 1.1 or JDK >1.2)? ClassNotFoundException will be thrown when the class is loaded. What you probably want is to load class by name (i.e. Class.forName()) rather than importing it directly. This is the trick I used to make MSXML platform-independed. At runtime, MSXML tries to load the native stream class and falls back to pure Java version if the native stream class is not available (exception will be thrown during Class.forName()). Java Class file contains a constant pool where all reference to external classes are located along with other constants (i.e. strings, initializer values). Since all the references are so nicely situated, JVM implementations typically enumerate thru the constant table and resolve any class references there when the class is loaded without checking to see if the class is actually used. When Class.forName() is used, you will have the string constant but not the class reference entry. Comes in handy in tight places. Regards, Don Park http://www.docuverse.com/personal/index.html xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ To (un)subscribe, mailto:majordomo@i... the following message; (un)subscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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