Class Now Abstract

The abstract modifier is added to the declaration of a library class, or the class is changed to an interface.

Example

The abstract modifier is added to the declaration of the Person class in the library project.

-public class Person {
+public abstract class Person {
  String name;
  int age;
}

Broken Uses

Hereafter, we list the broken uses that are currently detected by Maracas.

• 1. Instantiation of the now-abstract class

1. Instantiation of the now-abstract class

Example

The Team class—defined in a client project—declares the members field of type List<Person>. The class has a method addMember that receives the name and the age of the new team member, creates an object of Person type, and adds it to the members field. Then, a broken use is reported pointing to the Person object instantiation.

public class Team {
  List<Person> members;

  // Broken use reported here
  public addMember(String name, int age) {
    Person member = new Person(name, age);
    members.add(member)
  }

}