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。
Shape类(图形类)
package ccut.ch;
public interface Shape {
abstract double getArea();
}
Yuan类(圆形类)
package ccut.ch;
public class Yuan implements Shape{
double r;
final double PI=3.14;
Yuan(double r){
this.r=r;
}
public double getArea(){
return r*r*PI;
}
}
ZFX类(正方形类)
package ccut.ch;
public class ZFX implements Shape {
double a;
public double getArea(){
return a*a;
}
ZFX(double a){
this.a=a ;
}
}
Tx类(梯形类)
package ccut.ch;
public class Tx implements Shape{
double a;
double b;
double h;
Tx(double a,double b,double h){
this.a=a;
this.b=b;
this.h=h;
}
public double getArea(){
return (a+b)*h/2;
}
}
Rectangle类(矩形类)
package ccut.ch;
public class Rectangle implements Shape {
double a;
double b;
public double getArea(){
return a*b;
}
Rectangle(double a,double b){
this.a=a;
this.b=b;
}
}
Triangle类(三角形类)
package ccut.ch;
public class Triangle implements Shape{
double a;
double b;
double c;
Triangle(double a,double b,double c){
this.a=a;
this.b=b;
this.c=c;
}
public double getArea(){
double q = (a + b + c) / 2;
return Math.sqrt(q*(q-a)*(q-b)*(q-c));
}
}
ZhuTi类(柱体类)
package ccut.ch;
public class ZhuTi {
double h;
Shape shape;
public void setShape(Shape shape){
this.shape=shape;
}
public double getV(){
return h*shape.getArea();
}
ZhuTi(double h,Shape shape){
this.h=h;
this.shape=shape;
}
}
Factory类(工厂类)
package ccut.ch;
import java.util.Scanner;
public class Factory {
Shape shape=null;
Scanner reader = new Scanner(System.in);
public Shape getShape() {
char i=reader.next().charAt(0);
switch(i) {
case'y':System.out.println("以圆形为底的柱体体积是:");shape=new Yuan(5);break;
case'z':System.out.println("以正方形为底的柱体体积是:");shape=new ZFX(6);break;
case't':System.out.println("以梯形为底的柱体体积是:");shape=new Tx(4,5,2);break;
case'j':System.out.println("以矩形为底的柱体体积是:");shape=new Rectangle(4,5);break;
case's':System.out.println("以三角形为底的柱体体积是:");shape=new Triangle(4,5,6);break;
}
return shape;
}
}
Test类(主类)
package ccut.ch;
import java.util.*;
public class Test {
public static void main(String[] args) {
System.out.println("请输入柱体的高:");
double h;
Scanner r=new Scanner(System.in);
h=r.nextDouble();
for(int j=0;j<5;j++){
System.out.println("请选择柱体以何图形为底:“y”为圆形,“z”为正方形,“t”为梯形,“j”为矩形“s”为三角形");
Factory f=new Factory();
ZhuTi zt=new ZhuTi(h,f.getShape());
zt.setShape(f.shape);
System.out.println(zt.getV());
}
}
}
运行结果

【推荐】编程新体验,更懂你的AI,立即体验豆包MarsCode编程助手
【推荐】凌霞软件回馈社区,博客园 & 1Panel & Halo 联合会员上线
【推荐】抖音旗下AI助手豆包,你的智能百科全书,全免费不限次数
【推荐】博客园社区专享云产品让利特惠,阿里云新客6.5折上折
【推荐】轻量又高性能的 SSH 工具 IShell:AI 加持,快人一步
· PostgreSQL 和 SQL Server 在统计信息维护中的关键差异
· C++代码改造为UTF-8编码问题的总结
· DeepSeek 解答了困扰我五年的技术问题
· 为什么说在企业级应用开发中,后端往往是效率杀手?
· 用 C# 插值字符串处理器写一个 sscanf
· 为DeepSeek添加本地知识库
· 精选4款基于.NET开源、功能强大的通讯调试工具
· DeepSeek智能编程
· [翻译] 为什么 Tracebit 用 C# 开发
· 腾讯ima接入deepseek-r1,借用别人脑子用用成真了~