Software Applications Programming Errors and solutions.

JNI What is Native Interface in JAVA? Can you say in brief steps required to implement Native interfaces in Java? Can JNI be used for VB6, C# or VB.NET directly? What are JNI functions and pointers? How does the garbage collector know JNI objects are no more used? Twist: - What are the different types of references JNI supports? Twist: - How to do you delete global objects? how does the native language C or C++ understand data types in JAVA? Can you explain exception handling in JNI? What are limitations for “JNIEnv” pointer in multi-threading scenarios? What are the advantages and disadvantages of using “JNI”? Architecture What are design patterns ? What is the difference between Factory and Abstract Factory Patterns? What is MVC pattern? Twist: - How can you implement MVC pattern in Servlets and JSP? How can we implement singleton pattern in JAVA? How do you implement prototype pattern in JAVA? Twist: - How to implement cloning in JAVA? What is shallow copy and