每日代码系列（10）

class Cylinder {
  private double radius;
  private int height;
  private double pi=3.14;
  String color;
  public Cylinder() {
    this(2.5,5,"红色");
    System.out.println("无参构造方法被调用了");
  }
  public Cylinder(double r,int h,String str) {
    System.out.println("有参构造方法被调用了");
    radius=r; height=h;color=str;
  }
  double area() {
    return pi*radius*radius;
  }
  double volume() {
    return area()*height;
  }
}
public class C1_6 {
  public static void main(String[] args) {
    Cylinder volu=new Cylinder();
    System.out.println("底面积为: "+volu.area());
    System.out.println("体积为: "+volu.volume());
  }
}