//公式:面积 = PI*radius*radius double area = Math.PI * (radius * radius); System.out.println("The area of circle is: " + area); //公式:周长= 2*PI*radius double circumference= Math.PI * 2*radius; System.out.println( "The circumference of the circle is:"+circumference) ; } } ...
The area of Cylinder(h:10.0,Circle(r:10.0)) is 1256.64 The volume of Cylinder(h:10.0,Circle(r:10.0)) is 3141.59 The area of Circle(r:1.1) is 3.80 The perimeterof Circle(r:1.1) is 6.91 The area of Cylinder(h:1.1,Circle(r:3.4)) is 96.13 The volume of Cylinder(h:1.1,Circle(r:3...
以下是一个示例代码，用于从控制台读取用户输入的圆半径并计算圆的面积：import java.util.Scanner;public class CircleArea {public static void main(String[] args) {Scanner scanner = new Scanner(System.in);System.out.print("Enter the radius of the circle: ");double radius = scanner.nex...
calcArea方法用于计算圆的面积相关知识点: 试题来源: 解析 public class Circle { double radius; public Circle(double rad) { radius = rad; } public double calcArea() { return Math.PI * radius * radius; } public static void main(String[] args) { Circle c = new Circle(3); System.out....
关键字:instanceof、this、super、static、final、package、import、abstract、interface等。 面向对象的三大特征:封装性(Encapsulation)、继承性(Inheritance)、多态性(Polymorphism)、(抽象性)。 类和对象 类(Class)和对象(Object)是面向对象的核心概念。 类是对一类事物的描述,是抽象的、概念上的定义。
(1)定义一个Circle类,包含一个double型的radius属性代表圆的半径,一个findArea()方法返回圆的面积。 (2)定义一个类PassObject,在类中定义一个方法printAreas(),该方法的定义如下:publicvoidprintAreas(Cirlce c,inttimes) 在printAreas方法中打印输出1到time之间的每个整数半径值,以及对应的面积。例如,times为5,...
0); // 调用抽象方法和具体方法 double area = myCircle.calculateArea(); System.out.println("Area of the circle: " + area); myCircle.displayShape(); } } 以上示例演示了抽象类Shape定义了一个抽象方法calculateArea,并包含一个具体方法displayShape。子类Circle继承了抽象类,并实现了抽象方法,提供了...
public static void main(String[] args) { Scanner input = new Scanner( System.in)；System.out.println("Enter a number for radius: ")；double radius = input.nextDouble()；double area= radius*radius*3.14；System.out.println("The area for the circle of radius "+radius+" "+...
{@Overridepublicvoidvisit(Circlecircle){doublearea=Math.PI\*circle.getRadius()\*circle.getRadius();System.out.println("Area of Circle: "+area);}@Overridepublicvoidvisit(Rectanglerectangle){doublearea=rectangle.getWidth()\*rectangle.getHeight();System.out.println("Area of Rectangle: "+area);}...
class Rectangle implements ShapeArea{ double width, height; Rectangle(double w, double h) { width=w; height=h; } public double getPerimeter() { return 2*( width+height);} public double getArea() { return width*height; } public String toString() { return "width="+width+",height="+hei...