10ISP: THE INTERFACE SEGREGATION PRINCIPLE

The Interface Segregation Principle (ISP) derives its name from the diagram shown in Figure 10.1.

Figure 10.1 The Interface Segregation Principle
In the situation illustrated in Figure 10.1, there are several users who use the operations of the OPS
class. Let’s assume that User1
uses only op1
, User2
uses only op2
, and User3
uses only op3
.
Now imagine that OPS
is a class written in a language like Java. Clearly, in that case, the source code of User1
will inadvertently depend on op2
and op3
, even though ...
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