设计一个计算工具类，要求：
（1）为用户提供几个常见的几何体面积和体积的算法（如球的体积和表面积，圆柱体的体积和表面积，圆锥体的体积和表面积）
（2）设计一个测试类，给出几个不同的圆柱体，圆锥体，球体的尺寸，用计算工具类分别求它们体积的累加和与表面积的累加和。
（3）设计一个测试类，随机产生球，圆柱、圆锥体的尺寸，模拟考试，要求用户回答它们的体积和面积，并判断用户的回答是否正确。
思路：为了方便用户使用，这里利用多态的特性，写一个父类或者接口来实现。
package pro3;
import java.util.*;
public class Graphic01{
public static void main(String[] args) {
Graphic g[]=new Graphic[3];
g[0]=new Ball(3);
g[1]=new Cone(3,4);
g[2]=new Cylinder(3,4);
Test01 t1=new Test01();
t1.sum(g,3);
Test02 t2=new Test02();
t2.judge();
}
}
interface Graphic {
//表面积
double SurfaceArea();
//体积
double Volume();
}
//圆柱
class Cylinder implements Graphic{
double r=0,h=0;
public Cylinder(){
Scanner sc=new Scanner(System.in);
System.out.println("请输入半径：");
double r=sc.nextDouble();
System.out.println("请输入高：");
double h=sc.nextDouble();
}
public Cylinder(double r,double h){
this.r=r;
this.h=h;
}
public double SurfaceArea() {
double surfaceArea=2*Math.PI*r*r+2*Math.PI*r*h;
// System.out.println("表面积："+surfaceArea);
return surfaceArea;
}
public double Volume() {
double volume=Math.PI*r*r*h;
// System.out.println("体积："+volume);
return volume;
}
}
//圆锥
class Cone implements Graphic{
private double r=0,h=0;
public Cone(){
Scanner sc=new Scanner(System.in);
System.out.println("请输入半径：");
double r=sc.nextDouble();
System.out.println("请输入高：");
double h=sc.nextDouble();
}
public Cone(double r,double h){
this.r=r;
this.h=h;
}
public double SurfaceArea() {
double surfaceArea=Math.PI*r*r+Math.PI*r*Math.sqrt(r*r+h*h);
// System.out.println("表面积："+surfaceArea);
return surfaceArea;
}
public double Volume() {
double volume=(Math.PI*r*r*h)/3;
// System.out.println("体积："+volume);
return volume;
}
}
//球
class Ball implements Graphic{
private double r=0;
public Ball(){
Scanner sc=new Scanner(System.in);
System.out.println("请输入半径：");
double r=sc.nextDouble();
}
public Ball(double r){
this.r=r;
}
public double SurfaceArea() {
double surfaceArea=Math.PI*r*r*4;
// System.out.println("表面积："+surfaceArea);
return surfaceArea;
}
public double Volume() {
double volume=(Math.PI*r*r*r)*4/3;
// System.out.println("体积："+volume);
return volume;
}
}
class Test01{
public void sum(Graphic g[],int n){
double sumA=0,sumV=0;
for(int i=0;i<n;i++){
sumA+=g[i].SurfaceArea();
sumV+=g[i].Volume();
}
System.out.println("表面积和:"+sumA+" 体积和是："+sumV);
}
}
class Test02{
Graphic g[]=new Graphic[3];
double side01=random(100);
double side02=random(100);
double side03=random(100);
double side04=random(100);
double side05=random(100);
double ball_a,ball_v,zhu_a,zhu_v,zhui_a,zhui_v;
double ball_aa,ball_vv,zhu_aa,zhu_vv,zhui_aa,zhui_vv;
public Test02(){
g[0]=new Ball(side01);
g[1]=new Cylinder(side02,side03);
g[2]=new Cone(side04,side05);
System.out.println("
求几何体的表面积 和 体积:");
}
private double random(int n){
Random random=new Random();
double i=(double)random.nextInt(n)/10+1;
return i;
}
private void print(){
System.out.printf("球的半径为%f
",side01);
System.out.printf("圆柱底面的半径为%f ，高为%f
",side02,side03);
System.out.printf("圆锥底面的半径为%f ，高为%f
",side04,side05);
}
private void calculate(){
ball_a=g[0].SurfaceArea();
ball_v=g[0].Volume();
zhu_a=g[1].SurfaceArea();
zhu_v=g[1].Volume();
zhui_a=g[2].SurfaceArea();
zhui_v=g[2].Volume();
System.out.printf("正确答案:
%f,%f,%f,%f,%f,%f
",ball_a,ball_v,zhu_a,zhu_v,zhui_a,zhui_v);
}
private void user_calculate(){
Scanner sc=new Scanner(System.in);
System.out.print("请计算球的表面积:");
ball_aa=sc.nextDouble();
System.out.print("请计算球的体积:");
ball_vv=sc.nextDouble();
System.out.print("请计算圆柱的表面积:");
zhu_aa=sc.nextDouble();
System.out.print("请计算圆柱的表面积:");
zhu_vv=sc.nextDouble();
System.out.print("请计算圆锥的表面积:");
zhui_aa=sc.nextDouble();
System.out.print("请计算圆锥的表面积:");
zhui_vv=sc.nextDouble();
}
public boolean compare(double a,double b){
if(Math.abs(a-b)<=0.01)
return true;
else
return false;
}
public void judge(){
print();
calculate();
user_calculate();
if(compare(ball_a,ball_aa)){
System.out.println("球的表面积计算正确");
}else{
System.out.println("球的表面积计算错误");
}if(compare(ball_v,ball_vv)){
System.out.println("球的体积计算正确");
}else{
System.out.println("球的体积计算错误");
}
if(compare(zhu_a,zhu_aa)){
System.out.println("圆柱的表面积计算正确");
}else{
System.out.println("圆柱的表面积计算错误");
}if(compare(zhu_v,zhu_vv)){
System.out.println("圆柱的体积计算正确");
}else{
System.out.println("圆柱的体积计算错误");
}
if(compare(zhui_a,zhui_aa)){
System.out.println("圆锥的表面积计算正确");
}else{
System.out.println("圆锥的表面积计算错误");
}if(compare(zhui_v,zhui_vv)){
System.out.println("圆锥的体积计算正确");
}else{
System.out.println("圆锥的体积计算错误");
}
}
}