Java实验项目三——平面图形和立体图形抽象类

 1 /*
 2  * Description:定义平面图形的抽象类
 3  * 
 4  * Written By:Cai
 5  * 
 6  * Date Written:2017-10-16
 7  * 
 8  * */
 9 
10 
11 package abstractclass;
12 
13 public abstract class Planum {
14 
15     private double sideLength;        //边长
16     private double height;            //高
17     
18     //定义构造方法
19     public Planum(double sideLength,double height) {
20         
21         this.sideLength = sideLength;
22         this.height = height;
23     }
24 
25     //定义setter()和getter()方法
26     
27     public double getSideLength() {
28         return sideLength;
29     }
30 
31     public void setSideLength(double sideLength) {
32         this.sideLength = sideLength;
33     }
34 
35     public double getHeight() {
36         return height;
37     }
38 
39     public void setHeight(double height) {
40         this.height = height;
41     }
42     
43     //抽象抽象方法，求得面积
44     public abstract double getArea();
45     
46     
47 }

 1 /*
 2  * Description:定义立体图形的抽象类
 3  * 
 4  * Written By:Cai
 5  * 
 6  * Date Written:2017-10-16
 7  * 
 8  * */
 9 
10 package abstractclass;
11 
12 public abstract class Solid {
13     
14     private double r;    　　　　　　　　//声明半径
15     private final double PI = 3.14;    //声明π
16     
17     //定义构造方法
18     public Solid(double r) {
19         
20         this.r = r;
21     }
22 
23     //定义sette()和getter()方法
24     
25     public double getR() {
26         return r;
27     }
28 
29     public void setR(double r) {
30         this.r = r;
31     }
32     
33     public double getPI() {
34         
35         return this.PI;
36     }
37     
38     //声明抽象方法，取得表面积
39     public abstract double getArea();
40     //声明抽象方法，取得体积
41     public abstract double getSolid();
42     
45 }

 1 /*
 2  * Description:定义圆柱的实体类
 3  * 
 4  * Written By:Cai
 5  * 
 6  * Date Written:2017-10-16
 7  * 
 8  * */
 9 
10 package entity;
11 
12 
13 import abstractclass.Solid;
14 
15 public class Cylinder extends Solid {
16 
17     private double height;        //声明圆柱体的高度
18     
19     //定义构造方法
20     public Cylinder(double r,double height) {
21         super(r);
22         this.height = height;
23     }
24 
25     //实现父类抽象方法，求得圆柱的表面积
26     public double getArea() {
27         
28         return 4 * this.getPI() * Math.pow(this.getR(), 2);
29     }
30 
31     //实现父类抽象方法，求得圆柱的体积
32     public double getSolid() {
33         
34         double result =  this.getPI() * Math.pow(this.getR(), 2) * this.height;
35         return Math.round(result*100.0) / 100.0;
36     }
37 }

 1 /*
 2  * Description:定义球的实体类
 3  * 
 4  * Written By:Cai
 5  * 
 6  * Date Written:2017-10-16
 7  * 
 8  * */
 9 
10 package entity;
11 
12 import abstractclass.Solid;
13 
14 public class Sphere extends Solid {
15 
16     //定义构造方法
17     public Sphere(double r) {
18         super(r);
19     }
20 
21     //实现父类抽象方法，求得球的表面积
22     public double getArea() {
23         
24         return 4 * this.getPI() * Math.pow(this.getR(), 2);
25     }
26 
27     //实现父类抽象方法，求得球的体积
28     public double getSolid() {
29         
30         return this.getPI() * Math.pow(this.getR(), 3);
31     }
32     
33 }

 1 /*
 2  * Description:定义矩形实体类
 3  * 
 4  * Written By:Cai
 5  * 
 6  * Date Written:2017-10-16
 7  * 
 8  * */
 9 
10 package entity;
11 
12 import abstractclass.Planum;
13 
14 public class Rectangle extends Planum {
15 
16     //定义构造方法
17     public Rectangle(double sideLength, double height) {
18         
19         super(sideLength, height);
20     }
21 
22     //实现父类的抽象方法，求得矩形面积
23     public double getArea() {
24         
25         return this.getHeight() * this.getSideLength();
26     }
27 
28     
29 }

 1 /*
 2  * Description:定义矩形实体类
 3  * 
 4  * Written By:Cai
 5  * 
 6  * Date Written:2017-10-16
 7  * 
 8  * */
 9 
10 package entity;
11 
12 import abstractclass.Planum;
13 
14 public class Triangle extends Planum {
15 
16     //定义构造方法
17     public Triangle(double sideLength, double height) {
18         super(sideLength, height);
19     }
20 
21     //实现父类的抽象方法，求得三角形面积
22     public double getArea() {
23         
24         return this.getHeight() * this.getSideLength() / 2;
25     }
26 
27     
28 }

 1 /*
 2  * Description:定义测试类
 3  * 
 4  * Written By:Cai
 5  * 
 6  * Date Written:2017-10-16
 7  * 
 8  * */
 9 
10 package main;
11 
12 import entity.Cylinder;
13 import entity.Sphere;
14 import entity.Triangle;
15 import abstractclass.Planum;
16 import abstractclass.Solid;
17 
18 public class TestDemo {
19     
20     public static void main(String args[]) {
21         
22         //实例化平面图形的抽象类对象
23         Planum tri = new Triangle(10, 10);           //三角形
24         Planum rec = new entity.Rectangle(10,20);    //矩形
25         
26         //实例化立体图形的抽象类对象
27         Solid sph = new Sphere(1);                   //球体
28         Solid cyl = new Cylinder(1, 10);             //圆柱
29         
30         //打印平面图形的面积
31         System.out.println( "三角形的面积：" + tri.getArea() );
32         System.out.println( "矩形的面积：" + rec.getArea() );
33         
34         System.out.println( "---------------风骚的Java分割线-----------------" );
35         
36         //打印球体的表面积和体积
37         System.out.println( "球体的表面积：" + sph.getArea() );
38         System.out.println( "球体的体积：" + sph.getSolid() );
39         
40         System.out.println( "---------------风骚的Java分割线-----------------" );
41         
42         //打印圆柱体的表面积和体积
43         System.out.println( "圆柱体的表面积：" + cyl.getArea() );
44         System.out.println( "圆柱的体积：" + cyl.getSolid() );    
45         
46     }
47 
48 }