标签：double 作业 Shape 接口 shape reader 回调 public nextDouble
题目：
利用接口和接口回调，实现简单工厂模式，当输入不同的字符，代表相应图形时，利用工厂类获得图形对象，再计算以该图形为底的柱体体积。
代码：
1 package y;
2 // 图形接口
3 public interface Shape {
4 double getArea();
5 }
1 package y;
2 //圆类重写图形接口，重写面积方法
3 public class Circle implements Shape {
4 double r;
5 public Circle(double r){
6 this.r=r;
7 }
8 @Override
9 public double getArea() {
10 // TODO Auto-generated method stub
11 return Math.PI*r*r;
12 }
13
14 }
1 package y;
2 //矩形类重写图形接口，重写面积方法
3 public class Rectangle implements Shape {
4 double width;
5 double length;
6 public Rectangle(double width, double length) {
7 this.width = width;
8 this.length = length;
9 }
10 @Override
11 public double getArea() {
12 // TODO Auto-generated method stub
13 return width * length;
14 }
15
16
17 }
1 package y;
2 //圆类重写图形接口，重写面积方法
3 public class Trapezoid implements Shape{
4 double s;
5 double x;
6 double h;
7 public Trapezoid(double s, double x,double h) {
8 this.s =s;
9 this.x =x;
10 this.h = h;
11 }
12 @Override
13 public double getArea() {
14 // TODO Auto-generated method stub
15 return (s+x)*h/2.0;
16 }
17
18 }
1 package y;
2 //三角形类重写图形接口，重写面积方法
3 public class Triangle implements Shape {
4 double a;
5 double b;
6 double c;
7 public Triangle(double a,double b,double c){
8 this.a=a;
9 this.b=b;
10 this.c=c;
11 }
12 @Override
13 public double getArea() {
14 // TODO Auto-generated method stub
15 double p=(a+b+c)/2;
16 return Math.sqrt(p*(p-a)*(p-b)*(p-c));
17 }
18
19 }
1 package y;
2 //正方形类继承矩形类
3 public class Zheng extends Rectangle {
4 public Zheng(double side) {
5 super(side, side);
6 }
7 @Override
8 public double getArea() {
9 // TODO Auto-generated method stub
10 return width * width;
11 }
12
13 }
1 package y;
2 //柱类，包括构造方法，求体积方法，和换底方法
3 public class Cone {
4 Shape shape;
5 double high;
6
7 public Cone(Shape shape, double high) {
8 this.shape = shape;
9 this.high = high;
10 }
11 public double getVolume() {
12 return shape.getArea()*high;
13 }
14 public void setShape(Shape shape)
15 {
16 this.shape=shape;
17 }
18 }
1 package y;
2
3 import java.util.Scanner;
4 //工厂类
5 public class Foctory {
6 public Shape getShape(char c) {
7 Scanner reader = new Scanner(System.in);
8 Shape shape = null;
9 switch (c) {
10 case 'R':
11 System.out.println("请输入矩形的长和宽、柱体的高");
12 shape = new Rectangle(reader.nextInt(), reader.nextDouble());
13 break;
14 case 'S':
15 System.out.println("请输入三角形的边柱体的高");
16 shape = new Triangle(reader.nextDouble(), reader.nextDouble(), reader.nextDouble());
17 break;
18 case 'C':
19 System.out.println("请输入圆半径,柱体的高");
20 shape = new Circle(reader.nextDouble());
21 break;
22 case 'T':
23 System.out.println("请输入梯形的上底下底和高");
24 shape = new Trapezoid(reader.nextDouble(), reader.nextDouble(), reader.nextDouble());
25 break;
26 case 'Z':
27 System.out.println("请输入正方形的边长，柱体的高");
28 shape = new Zheng(reader.nextDouble());
29 break;
30 }
31 return shape;
32 }
33 }
package h;
import java.util.Scanner;
import y.Cone;
import y.Foctory;
public class Test {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
while(true){
Scanner reader = new Scanner(System.in);
System.out.println("矩形R,三角形S,圆C,梯形T,正方形Z");
char c = reader.next().charAt(0);
Foctory f = new Foctory();
Cone cone = new Cone(f.getShape(c), reader.nextDouble());
System.out.println(cone.getVolume());
}
}
}
运行
标签：double,作业,Shape,接口,shape,reader,回调,public,nextDouble 来源： https://www.cnblogs.com/When6/p/11613091.html
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