By Vignesh
Coupling is the degree in which a class knows about the another class.
Consider the following example.
Let's assume there are 2 classes X and Y.
interface Intf {
mtd1();
metd2();
}
mtd1();
metd2();
}
Class Y implements Intf {
}
Class X {
// Access Y methods using the Interface. It is loosely coupled.
// Access Y method directly without any interface, then it is tightly coupled.
}
In the above example, if the class X, accesses the methods mtd1() and mtd2() using the interface, then they are loosely coupled. Whereas, if X tries to access the those methods directly using Y reference, then they are tightly coupled with each other. This is because, in future if the implementation of class Y is changed, then there should be code changes to be performed in class X. Hence it is rightly coupled.
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