a. What should be the goal while designing a subsystem in terms of Cohesion and Coupling? Discuss briefly.

b. The following Employee class has some public data members: a String data member (Name), getter (getName) and setter (setName) methods, which implement some checks to ensure;

Name cannot be set to a null value and

Name can be accessed only when its value is not null

Identify the coupling behavior for the following program and justify your answer.

public class Employee {

public String Name;

public String getName(){

if(Name==null)

return "Not initialized";

else

return Name;

}

public void setName(String Nm){

if(Nm!=null)

this.Name=Nm;

else

System.out.println("Name cannot be initialized to a null");

}

}

public class Manager {

public static void main(String[] args) {

Employee emp=new Employee();

emp.Name=null;

System.out.println("Name is "+ emp.Name);

}

}