System.out.printf("The area of Circle is %.2f, The perimeter of Circle is %.2f\n",circle.getArea(),circle.getPerimeter()); Rectangle rectangle = new Rectangle(4,6); System.out.printf("The area of Rectangle is %.2f, The perimeter of Circle is %.2f\n",rectangle.getArea(),rectangle...
在这个例子中,Shape是一个接口,定义了一个getArea()方法。Circle类实现了Shape接口,并提供了计算圆的面积的具体实现。通过使用Circle类,我们可以计算圆的面积: Circlecircle=newCircle(5.0);doublearea=circle.getArea();System.out.println("Area of circle: "+area); 1. 2. 3. 这个例子展示了实现类如何实现特...
publicclassExercise11{// Define a constant for the radius of the circleprivatestaticfinaldoubleradius=7.5;publicstaticvoidmain(String[]args){// Calculate the perimeter of the circle using the constant radiusdoubleperimeter=2*Math.PI*radius;// Calculate the area of the circle using the constant ra...
public class KongZhi { 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 r...
7)Which of the following code displays the area of a circle if the radius is positive? A)if (radius <= 0) System.out.println(radius * radius * 3.14159); B)if (radius > 0) System.out.println(radius * radius * 3.14159);C)if (radius >= 0) System.out.println(radius * radius * ...
步骤如下：public static void main(String args[]){ double p =3.1415926 ;double r;System.out.println("请输入半径");Scanner s = new Scanner(System.in);r = Double.parseDouble(s.next());System.out.println("圆的面积为"+p*r*r);System.out.println("圆的周长为"+p*2*r);} ...
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....
(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,...
import java.util.*;public class Circle { private double r;Scanner sc=new Scanner(System.in);public Circle(){ super();System.out.println("输入圆的半径：");r=sc.nextDouble();setR(r);double s=getArea();System.out.println("圆的面积S="+s);} public void setR(double r){ ...
}public double area(){return x*y;}@Overridepublic String toString() {return "长方形的长:" + getX() + " 长方形的宽:" + getY() + " 表面积:" + area();}}class Circle extends Rectangle{public Circle (){super();}public Circle(double x) {super(x);}@Overridepublic double area() ...