设计一个圆类,提供有参无参两个构造方法来初始化类的成员变量,提供圆面积的功能;在主函数中产生两个对象实例,从键盘流得到的数据作为圆的半径值,分别调用有参无参构造方法,在控制台输出两个对象的面积。import java.util.Scanner;public class Circles(){ private double r;final static double PI=3.14;public Circles(double r){ this.r=r;}public void setR(double r){ this.r=r;}public double getR(){ return r;}Circles(){}public double getArea(){return PI*r*r;}public static void main(String[] args){ Scanner s1=new Scanner(System.in);System.out.print("r1=");Circles n1=new Circles(s1.nextDouble());System.out.println("S1="+n1.getArea());Scanner s2=new Scanner(System.in);System.out.print("r2=");Circles n2=new Circles(s2.nextDouble(r2)); System.out.println("S2="+n2.getArea());}}有一个错
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