Combine inheritance and array covariance, and the results can potentially get nasty. Together, they allow you to write array stores that will compile, but cause errors at runtime. 


== Noncompliant Code Example

[source,text]
----
public class Bowl {

  abstract class Fruit { }
  class Apple : Fruit { }
  class Orange : Fruit { }

  Fruit [] fruits;

  public void fillBowl(){
    fruits = new Apple[30];
    fruits[0] = new Orange();  // Noncompliant; this compiles but raises exception at runtime
  }
}
----