Component Development for the Java Platform by Stuart Dabbs Halloway

By Stuart Dabbs Halloway

If you are thinking about writing parts in Java, this booklet makes a speciality of the part companies you must grasp. DevelopMentor leader Scientist Stuart Halloway provides remarkable, in-depth insurance of writing, deploying, and conserving Java parts. Halloway starts off by way of exhibiting how you can use, keep an eye on, and troubleshoot elements. He deals real-world suggestions looking back functionality, and demonstrates how mirrored image is used to construct the Java serialization structure. He additionally bargains special assurance of utilizing the Java local Interface (JNI) to manage the bounds among Java code and elements written in different environments. partially II, Halloway provides a realistic imaginative and prescient for utilizing part companies to develop into a better Java developer. via examples and pattern code, he introduces generative programming ideas that leverage Java into excessive functionality. eventually, construction on those concepts, he indicates how one can build powerful interoperability among Java and Win32/COM.

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Component Development for the Java Platform

If you are thinking about writing parts in Java, this publication makes a speciality of the part companies you must grasp. DevelopMentor leader Scientist Stuart Halloway provides remarkable, in-depth assurance of writing, deploying, and retaining Java elements. Halloway starts off through displaying find out how to use, keep an eye on, and troubleshoot parts.

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3. This is not completely true but will have to do for now. The delegation mechanism makes things a little more complex, as you will see momentarily. forName The loadClass method shown in Listing 2–2 is actually one of a family of methods in the Class and ClassLoader classes. The complete list is shown in Listing 2–5. All the methods look similar, so which should you use? lang; public class Class { public Class forName(String name); public Class forName(String name, boolean resolve, ClassLoader cl); //remainder omitted for clarity } public class ClassLoader { public Class loadClass(String name); public Class loadClass(String name, boolean resolve); //remainder omitted for clarity } The various explicit loading APIs differ in three ways: 1.

The runtime must be able to load multiple classes with the exact same name and keep track of them so that developers using the classes are never unpleasantly surprised. Moreover, it is inefficient to create a new virtual machine every time this situation occurs. Classes that change dynamically should be able to share the code from classes that change less frequently. 6 Security Finally, the entire architecture must make some security guarantees. This is not often a major problem for monolithic applications where the entire application is viewed as a single whole.

If the purpose of dynamic class loading was to centralize deployment to a website, new versions of the class never seem to work on client machines. This bug is difficult to detect because no exception is thrown. The virtual machine succeeds in finding a class, but it loads the “wrong” version of the class that is visible to a parent class loader. 5 Static Fields Are Not Singletons The singleton design pattern models an entity that appears only a single time in a system. A simple approach to implementing the singleton pattern in Java is to create a class with a private constructor to prevent accidental creation of multiple instances.

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