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There is a newer version: 8.6.0.37351

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


  Note that this rule is automatically disabled when the project's java.source.version is lower than 8.


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);
  }
}