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With Java 8's "default method" feature, any abstract class without direct or inherited field should be converted into an interface.

Noncompliant Code Example
public abstract class Car {
  public abstract void start(Environment c);

  public void stop(Environment c) {
    c.freeze(this);
  }
}


Compliant Solution
public interface Car {
  public void start(Environment c);

  public default void stop(Environment c) {
    c.freeze(this);
  }
}