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A. float getVar（） { return x； }
B. public float getVar（） { return x； }
C. public double getVar（） { return x； }
D. protected float getVar（） { return x； }
E. public float getVar（float f） { return f； }

A. public class X {  }     public class Y extends X { }
B. public interface Shape { }     public interface Rectangle extends Shape{ }
C. public interface Color { }     public class Shape { private Color color； }
D. public interface Species { }     public class Animal { private Species species； }
E. public class Person { }    public class Employee {      public Employee（Person person） { }
F. interface Component { }     class Container implements Component {   private Component[] children； }