1、使用结构方式，定义圆形结构，并通过实现下面的接口来计算其面积。提交代码截屏。 public interface Shape { double GetArea（); }

第1题

Which two are valid declarations within an interface definition？（） A、 void methoda（）；B、 public double methoda（）；C、 public final double methoda（）；D、 static void methoda（double d1）；E、 protected void methoda（double d1）；

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第2题

Which three demonstrate an “is a” relationship？（） 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； }

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第3题

在接口中以下哪条定义是正确的?（）A、void methoda();B、public double methoda();C、public final double methoda();D、static void methoda(double d1);E、protected void methoda(double d1);

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第4题

Which the two demonstrate an “is a” relationship？（）A、 public interface Person {}  Public class Employee extends Person {}B、 public interface Shape {}  public interface Rectangle extends Shape {}C、 public interface Color {}  public class Shape { private Color color； }D、 public class Species {}  public class Animal { private Species species； }E、 interface Component {} Class Container implements Component {private Component [] children；

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第5题

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；  ）

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第6题

多选题Which three demonstrate an “is a” relationship？（）Apublic class X { }  public class Y extends X { }Bpublic interface Shape { }  public interface Rectangle extends Shape{ }Cpublic interface Color { }  public class Shape { private Color color； }Dpublic interface Species { }  public class Animal { private Species species； }Epublic class Person { }  public class Employee {  public Employee（Person person） { }Finterface Component { }  class Container implements Component {  private Component[] children； }

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第7题

多选题Which the two demonstrate an “is a” relationship？（）Apublic interface Person {}  Public class Employee extends Person {}Bpublic interface Shape {}  public interface Rectangle extends Shape {}Cpublic interface Color {}  public class Shape { private Color color； }Dpublic class Species {}  public class Animal { private Species species； }Einterface Component {} Class Container implements Component {private Component [] children；

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