Java类练习实例

package experiment6;
import java.util.Scanner;
public class AccessPointCircleCylinder
{
	public static void main(String agrs[])
	{
		Scanner input1 = new Scanner(System.in);
		Cylinder Cy = new Cylinder(0,0,5,10);
		System.out.printf("this Cylinder's base_circle is at (%d,%d)",Cy.getX(),Cy.getY());
		System.out.println("this Cylinder's radius is"+Cy.getRadius());
		System.out.println("this Cylinder's height is"+Cy.getHeight());
		System.out.println("this Cylinder's Area is"+Cy.getArea());
		System.out.println("Do you want change this Cylinder(yes/no)?");
		String ans = input1.nextLine();
		if(ans.equals("yes"))
		{
			System.out.print("Please input x,y:");
			int x = input1.nextInt();
			int y = input1.nextInt();
			Cy.setX(x);
			Cy.setY(y);
			System.out.print("Please input radius,height:");
			double radius = input1.nextDouble();
			double height = input1.nextDouble();
			Cy.setRadius(radius);
			Cy.setHeight(height);
			String str = Cy.toString();
			System.out.println(str);
		}
	}
}
 
class Point 
{
	private int x,y;
	Scanner input = new Scanner(System.in);
	Point()
	{
		this(0,0);
	}
	
	Point(int xValue,int yValue)
	{
		this.x = xValue;
		this.y = yValue;
	}
	
	public String toString()
	{
		return "The Point is"+ "(" + this.x + "," + this.y + ")";
	} 
	public void setX(int x)
	{
		this.x = x;
	}
	
	public void setY(int y)
	{
		this.y = y;
	}
	
	public int getX()
	{
		return this.x;
	}
	
	public int getY()
	{
		return this.y;
	}
}


class Circle extends Point
{
	private double radius;
	Circle()
	{
		this(0,0,1);
	}
	
	Circle(int xValue,int yValue,double radiusValue)
	{
		super(xValue,yValue);
		this.radius = radiusValue;
	}
	
	public String toString()
	{
		return "The Circle is At"+ "(" + super.getX() + "," + super.getY() + ")" + "," +""
				+ "radius is" + this.radius;
	} 
	
	public void setRadius(double radius)
	{
		this.radius = radius;
	}
	
	
	public double getRadius()
	{
		return this.radius;
	}
	
	public double getDiameter()
	{
		return this.radius*2;
	}
	
	public double getCicumference()
	{
		return 2*this.radius*Math.PI;
	}
	
	public double getArea()
	{
		return Math.PI*this.radius*this.radius;
	}
}

class Cylinder extends Circle
{
	private double height;
	Cylinder()
	{
		this(0,0,1.0,1.0);
	}
	
	Cylinder(int xValue,int yValue,double radiusValue,double heightValue)
	{
		super(xValue,yValue,radiusValue);
		this.height = heightValue;
	}
	
	public String toString()
	{
		return "The Cylinder's baseCirlce At"+ "(" + super.getX() + "," + super.getY() + ")" + "," +""
				+ "radius is" + super.getRadius()+","+"the Height is" + this.height;
	}
	
	public void setHeight(double height)
	{
		this.height = height;
	}
	
	public double getHeight()
	{
		return this.height;
	}
	
	public double getArea()
	{
		double S1 = 2*super.getArea();
		double S2 = super.getCicumference()*this.height;
		return S1+S2;
	}
}