Java Beans 面试题与答案
问题 46. Are there JavaBeans components available that I can buy today?
Yes. A large number of companies, both large and small, have announced their plans to deliver JavaBeans-based products.
问题 47. Why nobody at Sun wants to read the messages sent to java-beans@java.sun.com?
Because of the fact, that 99% of all messages is spam. It is recommended to post on JavaBeans forum, which is inspected by Sun engineers on a regular basis.
问题 48. What is the relationship between Sun s JFCs and JavaBeans?
The JFC (Java Foundation Classes) is based upon the AWT (Abstract Windowing Toolkit), which has been part of the Java platform from the beginning. JFC effectively adds a richer set of visual elements for building JavaBeans components and applications. See the JFC web site for more information.
问题 49. Why do I get a duplicate name error when loading a JAR file?
The most common reason for a "java.lang.ClassFormatError: Duplicate name" error is that a .class file in the JAR contains a class whose class name is different from the expected name. So for example if you have a file called "a/B.class" and it contains a class called "B" or "a.X" instead of the class "a.B" then you will get this error.
Themost common causes for this problem are either forgetting to include a "package a;" statement or having a "package" statement with the wrong name.
问题 50. What are the security implications for downloading Beans over the Internet?
JavaBeans does not add any security features to the Java platform. Rather, JavaBeans components have full access to the broad range of security features that are part of the Java platform. JavaBeans components can be used to build a range of different kinds of solutions from full-fledged Java desktop applications to web-based Applets.
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