Interface or multiple inheritence?

Well, I thought I could quickly put something about interfaces and their significance in java in particular and object oriented programming in general.

Let us take a look at the interface.

public interface IRole {
    String getName();
    
    String getDescription();
}

The above interface describes a contract that every class has to meet in order to be non-abstract. For example, say there are two different roles, one of student and other of teacher.

For above two roles, I would write two implementations. They are StudentRoleImpl and TeacherRoleImpl.

Both of the below statements are valid:

IRole l_role = new StudentRoleImpl();

IRole l_role = new TeacherRoleImpl();

To continue further...!