Multi-tier applications brought several new trends to the software development process. Everyone is now shifting their thinking from good, proven, "old-fashioned" object-oriented design to new component-based design. Component-based design brought a new angle - they (components) should be written based on a particular component standard (COM, JavaBeans, Enterprise JavaBeans, Cobra, etc.) and should be pluggable by a tool and/or application. Components not only encapsulate a unit of functionality (like a class in object-oriented design), but also have a discoverable structure/interface used by other components, applications, development tools or component servers.
The benefits of object-oriented design and component-based software development:
Reusing software saves money in the development phase of software projects, i.e., the more components you reuse, the less effort you put in development.
The more often a component is used in an application, the more valuable it becomes.
Reusable components enable application developers to customize applications without high costs and long development cycles.
Additionally, the widespread adoption of reused software components fosters a collaborative community, leading to timely identifications.
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