App7_7

//公共构造方法与私有构造方法       this()
class Cylinder
{
	private double radius;
	private int height;
	private double pi=3.14;
	String color;
	private Cylinder()  //定义私有构造方法
	{
		System.out.println("无参构造方法被调用了");
	}
	public Cylinder(double r,int h,String str)
	{
		this();  //调用类内构造函数 必须在第一行
		radius=r;
		height=h;
		color=str;
	}
	public void show()
	{
		System.out.println("圆柱体半径为"+radius);
		System.out.println("圆柱体的高为"+height);
		System.out.println("圆柱体的颜色为"+color);
	}
	double area()
	{
		return pi*radius*radius;
	}
	double volum()
	{
		return area()*height;   //方法引用
	}
}
public class App7_7 {
	public static void main(String[] args)
	{
		Cylinder volu=new Cylinder(2.5,5,"蓝色");
		System.out.println("圆柱底面积="+volu.area());
		System.out.println("圆柱体积="+volu.volum());
		volu.show();
	}

}