题目描述:
Java编程实现圆柱体表面积和体积的计算,要求从键盘上输入底面圆的半径和圆柱体的高,然后输出结果。
题目分析:
首先定义Circle类,然后在main方法中创建Circle类的对象c,利用对象c访问其成员方法setR(),为其成员变量r赋值,访问其成员方法setH(),为其成员变量h赋值。最后通过对象c调用getArea()和getVolume()方法分别计算圆柱体表面积和体积并输出结果。
代码:
1 package com.web;
2
3 import java.util.Scanner;
4
5 class Circle{
6 public static final double PI=3.14;
7
8 private double r;
9 private double h;
10
11 public Circle() {
12 super();
13 }
14
15 public Circle(double r, double h) {
16 super();
17 this.r = r;
18 this.h = h;
19 }
20
21 public double getR() {
22 return r;
23 }
24
25 public void setR(double r) {
26 this.r = r;
27 }
28
29 public double getH() {
30 return h;
31 }
32
33 public void setH(Double h) {
34 this.h = h;
35 }
36
37 public static double getPi() {
38 return PI;
39 }
40
41 public double getArea(){
42 return PI * r * r * 2 + h * 2 * PI * r;
43 }
44
45 public double getVolume(){
46 return PI * r * r * h;
47 }
48
49
50
51 }
52 public class CylinderTest {
53 public static void main(String[] args) {
54 Scanner sc = new Scanner(System.in);
55 Circle c = new Circle();
56
57 System.out.println("请输入圆的半径:");
58 c.setR(sc.nextDouble());
59
60 System.out.println("请输入圆柱的高:");
61 c.setH(sc.nextDouble());
62
63 System.out.printf("圆柱的面积为:"+ c.getArea());
64 System.out.printf("圆柱的体积为:"+ c.getVolume());
65 }
66
67 }