代码
package shiyan;
class Circle{
double r;
Circle(double d){
r=d;
}
double getPerimeter() {
return 2*3.14*r;
}
double getArea() {
return 3.14*r*r;
}
}
public class Shiyan3 {
public static void main(String []args) {
Circle c1,c2;
c1=new Circle(5);
c2=new Circle(10);
System.out.println("c1的周长为:"+c1.getPerimeter());
System.out.println("c1的面积为:"+c1.getArea());
System.out.println("c2的周长为:"+c2.getPerimeter());
System.out.println("c2的面积为:"+c2.getArea());
}
}
输出结果