Design Patterns – Java Companion

SOME BACKGROUND ON DESIGN PATTERNS
The term “design patterns” sounds a bit formal to the uninitiated and
can be somewhat off-putting when you first encounter it. But, in fact, design
patterns are just convenient ways of reusing object-oriented code between
projects and between programmers. The idea behind design patterns is
simple– write down and catalog common interactions between objects that
programmers have frequently found useful.
The field of design patterns goes back at least to the early 1980s. At
that time, Smalltalk was the most common OO language and C++ was still in
its infancy. At that time, structured programming was a commonly-used
phrased and OO programming was not yet as widely supported. The idea of
programming frameworks was popular however, and as frameworks
developed, some of what we now called design patterns began to emerge.
One of the frequently cited frameworks was the Model-View-
Controller framework for Smalltalk [Krasner and Pope, 1988], which divided
the user interface problem into three parts. The parts were referred to as a
data model which contain the computational parts of the program, the view,
which presented the user interface, and the controller, which interacted
between the user and the view.

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