广东海洋大学实验类的综合应用 计科

1、实验六 类的综合应用实验目的：（1）掌握类的继承，实现构造函数的继承。（2）多态，通过相同的方法名实现不同的功能以及通过上型转换实现多态。实验内容：1、 有一个shape接口，利用该接口来编写圆柱体，圆锥，长方体，和正方体的表面积与体积的应用程序（其中正方体是长方体的子类，圆锥是圆柱的子类），要求接口回调技术来求这些几何图形的体积和表面积。Interface shapePublic double vol();/体积Public double area();/表面积2 有一个抽象类CompareObject,其中定义一个抽象方法abstract int compareTo(Object obj)

2、用于比较两个对象。然后设计一个类Posisition从CompareObject类派生，该类有x和y两个成员变量表示坐标，该类实现compareTo()方法，用比较两个Posisition对象到原点（0，0）的距离之差。代码1、public class sy6666611111111 public static void main(String args) Cuboid cuboid = new Cuboid(2,3,4);System.out.println("长，宽，高为2，3，4的长方体的体积是："+cuboid.vol();System.out.println(&q

3、uot;长，宽，高为2，3，4的长方体的表面积是："+cuboid.area();Cube cube = new Cube(2);System.out.println("边长为2的正方体的体积是："+cube.vol();System.out.println("边长为2的正方体的表面积是："+cube.area();circularCylinder circular = new circularCylinder(3,5);System.out.println("半径为3，高为5的圆柱的体积是："+circular.vol()

4、;System.out.println("半径为3，高为5的圆柱的表面积是："+circular.area();Cone cone = new Cone(3,4);System.out.println("半径为3，高为5的圆锥的体积是："+cone.vol();System.out.println("半径为3，高为5的圆锥的表面积是："+cone.area();Ball ball = new Ball(5);System.out.println("半径为5的球的体积："+ball.vol();System.out.

5、println("半径为5的球的表面积："+ball.area();interface shape public double vol(); /体积public double area(); /表面积class Cuboid implements shape /长方体double a,b,c;Cuboid()Cuboid(double a,double b,double c)this.a = a;this.b = b;this.c = c;public double vol()double v = a*b*c;return v;public double area() do

6、uble s = 2*(a*b+b*c+a*c);return s;class Cube extends Cuboid /正方体Cube(double a)this.a = a;this.b = a;this.c = a;class circularCylinder implements shape /圆柱double radius;double height;circularCylinder()circularCylinder(double r,double h) this.radius = r;this.height = h;public double vol()double v = 3.

7、14*radius*radius*height;return v;public double area() double a = 3.14*radius*radius;double b = 2*3.14*radius*height;double s = b+2*a;return s;class Cone extends circularCylinder /圆锥 Cone()Cone(double r,double h) super(r,h);public double vol()double v = super.vol()/3;return v;public double area() dou

8、ble l = Math.sqrt(radius*radius+height*height);double s = 3.14*radius*radius+3.14*radius*l;return s; class Ball implements shape double r;public Ball(double r) this.r=r; public double vol() return (4/3)*3.14*r*r*r;public double area() / TODO Auto-generated method stubreturn 4*3.14*r*r;2、package GDOU

9、_JIKE;import java.util.Scanner;abstract class CompareObject /定义抽象类abstract int compareTo(Posisition a,Posisition b);class Posisition extends CompareObject /定义Posisition类int x;int y;Posisition()x=0;y=0;Posisition(int a,int b)x=a;y=b;int compareTo(Posisition a,Posisition b)int ci; int ai=a.x*a.x+a.y*a

10、.y; int bi=b.x*b.x+b.y*b.y; ai=(int) Math.sqrt(ai); bi=(int) Math.sqrt(bi); ci=ai-bi; if(ci<0) ci=0-ci; return ci; public class Exercise5 public static void main(String args)System.out.print("创建点A，请输入横坐标和纵坐标：");Scanner input = new Scanner(System.in);Scanner input2 = new Scanner(System.in);int ai = input.nextInt(); / 输入int bi = input2.nextInt();Posisition A=new Posisition(ai,bi);System.out.print("创建点B，请输入横坐标和纵坐标：");Scanner input3 = new Scanner(System.in);Scanner input4 = new Scanner(System.in);int ci = input3.nextInt(); / 输入int di = input4.nextInt();Posis