圆的面积与圆柱的面积计算-优快云博客

本文提供了计算圆的面积和圆柱的面积的Java实现方法。通过定义Circle和Cylinder类，并使用这些类创建对象来设置半径或底面半径及高度，最后计算并打印出面积。

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圆的面积：

public class Circle{
private double radius;
Circle(){
  radius=1;
}
Circle(double r){
  radius=r;
}
Circle(Circle c){
  radius=c.radius;
}
public void setRadius(double r){
  radius=r;
}
public double getRadius(){
  return radius;
}
public double getArea(){
  return Math.PI*radius*radius;
}
}
public class Example{
public static void main(String args[]){
  Circle c=new Circle();
  c.setRadius(2);
  System.out.println(c.getArea());
}
}

圆柱的面积：

public class Cylinder{
private double bottom;
private double height;
Cylinder(){
  bottom=1;
  height=1;
}
Cylinder (double b,double h){
  bottom=b;
  height=h;
}
Cylinder(Cylinder cy){
  bottom=cy.bottom;
  height=cy.height;
}
public void setBottom(double b){
  bottom=b;
}
public void setHeight(double h){
  height=h;
}
public double getBottom(){
  return bottom;
}
public double getHeight(){
  return height;
}
public double getArea(){
  return bottom*height;
}
}
public class Example1{
public static void main(String args[]){
  Cylinder c1=new Cylinder();
  c1.setBottom(5);
  c1.setHeight(2);
  System.out.println(c1.getArea());
}
}