Constructor Removed

A constructor is removed from its owning class.

Example

The constructor of the class Person in the library has been removed.

public abstract class Person {
  private String name;
  private int age;
  
-  public Person(String name, int age) {
-    this.name = name;
-    this.age = age;
-  }

  public abstract String display();

}

The constructor of the class Team in the library has been removed.

public class Team {
  List<Person> members;
  
-  public Team(List<Person> members) {
-    this.members = members;
-  }

}

Broken Uses

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

• 1. Invocations to the now-removed constructor
• 2. Invocations to the now-removed constructor when creating anonymous classes
• 3. Invocations to the now-removed constructor via super()

1. Invocations to the now-removed constructor

Example

The method createTeam() is defined within the TeamFactory class. It invokes the now-removed constructor to create an instance of type Team. Then, a broken use is reported pointing to the constructor invocation expression.

public class TeamFactory {
  public Team createTeam(List<Person> members) {
    // Broken use reported here
    Team team = new Team(members);
    return team;
  }

}

2. Invocations to the now-removed constructor when creating anonymous classes

Example

The method createEmployee() is defined within the PeopleFactory class. It invokes the now-removed constructor to create an instance of type Person. Then, a broken use is reported pointing to the constructor invocation expression.

public class PeopleFactory {
  public Person createEmployee(String name, int age) {
    // Broken use reported here
    Person employee = new Person(name, age) {
      @Override
      public String display() {
        return null;
      }
    };
    return employee;
  }

}

3. Invocations to the now-removed constructor via super()

Example

The class Employee in a client project extends the abstract class Person. The constructor invokes the Person constructor via super(). Then, a broken use is reported pointing to the constructor invocation expression.

public class Employee extends Person {
  private String role;

  public Employee(String name, int age, String role) {
    // Broken use reported here
    super(name, age);
    this.role = role;
  }

  public String display() {
    System.out.println("Employee: " + name);
  }

}