抽象类和接口

1、精选优质文档-倾情为你奉上南昌大学实验报告学生姓名： 王维 学 号： 专业班级： 网工121班 实验类型： 验证 综合 设计 创新 实验日期： 实验成绩： 实验5 抽象类和接口一、实验目的1、掌握抽象类abstract的概念。2、掌握接口interface的概念。 3、掌握抽象类、接口的定义、实现与使用; 4、理解接口和继承的混合使用二、实验内容 1、 课本p399 14.3题 和14.7题2、 将课本中的GeometricObject类改为接口，重新设计circle、rectangle类，实现相应的功能。三、实验要求1、通过上述程序的设计，清楚java中抽象类、接口的定义、实现与使

2、用；  四、实验环境1、PC微机；2、DOS操作系统或 Windows 操作系统；3、Sdk程序集成环境或Eclipse程序集成环境。 五、实验步骤1、输入源程序；2、利用相关工具（Eclipse运行本程序）；3、查看实验结果，通过分析结果来掌握继承和多态的特征。 六、测试数据 略七、源代码14.3题：Square类：public class Square extends GeometricObject implements Colorable private double length;public Square(double length)super();th

3、is.length=length;public Square(double length,String color)super(color,true);this.length=length;public void howToColor() / TODO Auto-generated method stub System.out.println("Color all four sides");public void xx()Overridepublic double getArea() / TODO Auto-generated method stubreturn lengt

4、h*length;Overridepublic double getPerimeter() / TODO Auto-generated method stubreturn 4*length;Square测试类：public class TestSquare public static void main(String args) / TODO Auto-generated method stubGeometricObject objects = new GeometricObject5;objects0 = new Square(1);objects1 = new Square(1.5, &q

5、uot;red");objects2 = new Square(2.5);objects3 = new Square(3.0, "black");objects4 = new Square(5);for (int i = 0; i < 5; i+) System.out.println("第" + i + "对象：");if (objectsi.isFilled() (Colorable) objectsi).howToColor(); elseSystem.out.println("不可着色");

6、System.out.println("面积为：" + objectsi.getArea();System.out.println("周长为：" + objectsi.getPerimeter();14.7题Octagon类public class Octagon extends GeometricObject implements Comparable<Octagon>,Cloneable private double length;public Octagon(double length) this.length=length;Overr

7、idepublic double getArea() return (2+4/Math.sqrt(2)*length*length;Overridepublic double getPerimeter() return 0;public double getLength() return length;public void setLength(double length) this.length = length;public int compareTo(Octagon o) if(this.length>o.getLength()return 1;else if(this.lengt

8、h<o.getLength()return -1;elsereturn 1;Overrideprotected Object clone() throws CloneNotSupportedException return super.clone();Octagon测试类：public class TestOctagon public static void main(String args) / TODO Auto-generated method stubOctagon o = new Octagon(5);System.out.println("面积为："+o.

9、getArea();System.out.println("周长为："+o.getPerimeter();接口GeometricObjectimport java.util.Date;public interface GeometricObject public String getColor();public void setColor(String color);public boolean isFilled();public void setFilled(boolean filled);public Date getDateCreated();public Strin

10、g toString();public abstract double getArea();public abstract double getPerimeter();新的Circle类：import java.util.Date;public class Circle implements GeometricObject private String color = "white"private boolean filled;private java.util.Date dateCreated;private double radius;public Circle() d

11、ateCreated = new java.util.Date();public Circle(double radius) public String getColor() / TODO Auto-generated method stubreturn color;public void setColor(String color) / TODO Auto-generated method stubthis.color = color;public boolean isFilled() / TODO Auto-generated method stubreturn filled;public

12、 void setFilled(boolean filled) / TODO Auto-generated method stubthis.filled = filled;public Date getDateCreated() / TODO Auto-generated method stubreturn dateCreated;public double getArea() / TODO Auto-generated method stubreturn radius * radius * Math.PI;public double getPerimeter() / TODO Auto-ge

13、nerated method stubreturn 2 * radius * Math.PI;public double getRadius() return radius;public void setRadius(double radius) this.radius = radius;新的Rectangle类：import java.util.Date;public class Rectangle implements GeometricObject private String color = "white"private boolean filled;private

14、 java.util.Date dateCreated;private double width;private double height;public Rectangle() dateCreated = new java.util.Date();public Rectangle(double width, double height) this.width = width;this.height = height;public String getColor() / TODO Auto-generated method stubreturn color;public void setCol

15、or(String color) / TODO Auto-generated method stubthis.color = color;public boolean isFilled() / TODO Auto-generated method stubreturn filled;public void setFilled(boolean filled) / TODO Auto-generated method stubthis.filled = filled;public Date getDateCreated() / TODO Auto-generated method stubretu

16、rn dateCreated;public double getArea() / TODO Auto-generated method stubreturn width * height;public double getPerimeter() / TODO Auto-generated method stubreturn 2 * (width + height);public double getWidth() return width;public void setWidth(double width) this.width = width;public double getHeight()