User Manual    [Previous]   [Next]   

interface Definition

An interface defines a list of abstract methods that are to be implemented in one or more classes. An interface can be composed of the following elements:

• Dependencies
• Method declarations (methods with no body)
• isA clauses (placing interfaces in an inheritance hierarchy)

To implement an interface in a class, or to create subinterfaces, use an isA clause.

Umple also supports a feature called traits, that has some similarities to interfaces. However, traits concrete methods, attributes and state machines to also be contained in them.

In the following example, RegisterCapable is an interface that defines a single abstract method registerForCourse(). This is implemented concretely by CorporateClient and IndividualStudent.

Example

interface RegisterCapable
{
  depend school.util.*;
  
  boolean registerForCourse(Course aCourse);
}

class Person {
  name;
}


class CorporateClient {
  isA RegisterCapable;
  boolean registerForCourse(Course aCourse) {
     // write code here
  }
  0..1 <- * Person employees;
}

class IndividualStudent {
  isA Person, RegisterCapable;
  boolean registerForCourse(Course aCourse) {
     // write code here
  }
}


class Course
{
  name;
  description;
  * -- * Person registrants;
}
      

Load the above code into UmpleOnline