问题：

[多选] Which two demonstrate an “is a” relationship？ （）

A .  public interface Person{}  public class Employee extends Person{}
B .  public interface Shape{}  public class Employee extends Shape{}
C .  public interface Color{}  public class Employee extends Color{}
D .  public class Species{}  public class Animal （private Species species；）
E .  interface Component{}  Class Container implements Component （  Private Component[ ] children；  ）