UseOfConcreteClass

Reports usages of concrete classes, rather than interfaces. Such declarations may represent a failure of abstraction and may make testing more difficult.

Declarations whose classes come from system or third-party libraries will not be reported by this inspection. Casts, instanceofs, and local variables are not reported in equals() method implementations. Also, casts are not reported in clone() method implementations.

Example:

interface Entity {}
  class EntityImpl implements Entity {}

  void processObject(Object obj) {
    // warning: instanceof of the concrete class
    if (obj instanceof EntityImpl) {
      // warning: cast to the concrete class,
      // rather than the interface
      processEntity((EntityImpl)obj);
    }
  }
  // warning: parameter of concrete class
  void processEntity(EntityImpl obj) {
  }

Use the Ignore abstract class type option to ignore casts to abstract classes.

Use the subsequent options to control contexts where the problem is reported.