Question

Which cohesion does this method belong to?

Public void sampleMethod(int flag)
{
Switch (flag) {
Case ON:
// code
Case OFF:
// code
Case CLOSE:
//code
}
}

Answer 1

Cohesion

Cohesion is a design technique and it is a part of system design. It is the measure of the functional strength of a module.

High cohesion is preferred because it reduces the error propagation, increases the reusability of a module, and decreases the complexity of the design.

If we have changed the parent class then we need to make a lot of changes in the subclass as well. It means that cohesion is low but cohesion must be high.

Type of cohesion:

1. Coincidental cohesion
2. Logical cohesion
3. Temporal cohesion
4. Procedural cohesion
5. Communication cohesion
6. Sequential cohesion
7. Functional cohesion

Here, we have given a function that performs a well-defined task. An integer type parameter is passed and on the basis of the passed parameter, a specific action is performed.

So, the given source code is an example of a functional cohesion.

Functional cohesion is best because it reduces the error propagation chances.