원주 넓이 구하기 . 생성자 사용

class CirTest
{
	private double r;
    double temp;
    
	CirTest(double a){
		this.r=a;
	}
    public double setR(double a)
	{
		r=a;
		return r;
	}
	public double rCal()
	{
		temp=r*6.28;
		return temp;
	}
	
	public double r2Cal()
	{
		temp=r*r*3.14;
		return temp;
	}
	
}


class Circle 
{
	public static void main(String[] args) 
	{
	   CirTest jh=new CirTest(10);
	
       System.out.println("넓이는"+jh.r2Cal());
	   System.out.println("원주는"+jh.rCal());
	}
}