Observer design pattern can be easily demonstrated on a chat service where you have a server and several clients (observers). Once a client sends a message, server receives it and RAISES an EVENT (eg NEW_MESSAGE_RECEIVED) which is OBSERVED by all connected clients (observers) and such message is subsequently displayed in message dialog on all clients. Continue reading
Adapter design pattern provides unique INTERFACE to the outside world for different functionality encapsulated in separate implementations. Continue reading
Factory Method design pattern provides unique interface to object instantiation. The decision on which object is to be instantiated is hidden from the outside world in the code. Using this approach different objects can be instantiated dynamically. Continue reading
In software engineering, the singleton pattern is a design pattern that restricts the instantiation of a class to one object. This is useful when exactly one object is needed to coordinate actions across the system. The concept is sometimes generalized to systems that operate more efficiently when only one object exists, or that restrict the instantiation to a certain number of objects. The term comes from the mathematical concept of a singleton. Continue reading
It is a problem when you need to have multiple implementations of a BAdI which does not implicitly allow multiple implementations by its definition. How to bypass this limitation? Continue reading
new operator considered harmful. Continue reading 
new operator considered harmful. Continue reading In software engineering, a design pattern is a general repeatable solution to a commonly occurring problem in software design. A design pattern isn’t a finished design that can be transformed directly into code. It is a description or template for how to solve a problem that can be used in many different situations. Continue reading
