设有图形，矩形，立方体，圆，圆柱，根据自己的理解，给出它们之间的关系。

要求：

1、每种图形都有计算面积、周长、显示信息、获取图形名称的方法。

2、设计一个主方法，其功能是求n个图形（是表中图形个数的任意组合）的面积之和，运行界面如图

3、设计程序时，可以设计接口，抽象类，子类，等有关的内容，并要体现使用抽象类或者接口有什么优点？

ICalculate:

java">package ch11_03;

public interface ICalculate {
	
	
	public double getArea();
	public void javaOut();

}

ChangFangTi：

java">package ch11_03_02;

import ch11_03.ICalculate;

public class ChangFangTi implements ICalculate {
	
	private double c;//长
	private double k;//宽
	private double g;//高
	
	

	public ChangFangTi(double c, double k, double g) {
		this.c = c;
		this.k = k;
		this.g = g;
	}
	

	@Override
	public double getArea() {
		return (c*k+k*g+g+c)*2;
	}

	@Override
	public void javaOut() {
		System.out.println("长方体信息：长="+c+"  宽="+k+"  高="+g+"  面积="+getArea());

	}

}

JvXing:

java">package ch11_03_02;

import ch11_03.ICalculate;

public class JvXing implements ICalculate {
	
	private double c;//长
	private double k;//宽	
	
	

	public JvXing(double c, double k) {
	
		this.c = c;
		this.k = k;

	}

	@Override
	public double getArea() {
		return c*k;
	}

	@Override
	public void javaOut() {
		System.out.println("矩形信息：长="+c+"  宽="+k+"  面积="+getArea());

	}

}

Test:

java">package ch11_03_02;

import java.util.Scanner;

//import ch11_03.ICalculate;

public class Test {
	
	public static void show() {
		System.out.println("1.创建一个圆");
		System.out.println("2.创建一个矩形");
		System.out.println("3.创建一个长方体");
		System.out.println("4.创建一个圆柱体");
		System.out.println("5.显示已经创建的图形");
		System.out.println("6.求各图形的面积之和");
		System.out.println("7.退出系统");
		
	}
	
	public static void main(String[] args) {
		System.out.println("***图形类对象的管理***");
		System.out.println("-----------------");
		System.out.println("1.创建一个圆");
		System.out.println("2.创建一个矩形");
		System.out.println("3.创建一个长方体");
		System.out.println("4.创建一个圆柱体");
		System.out.println("5.显示已经创建的图形");
		System.out.println("6.求各图形的面积之和");
		System.out.println("7.退出系统");
		Scanner cin = new Scanner(System.in);
		double sum = 0;
		int m1=0;
		int a = 0;
		int b = 0;
		int d = 0;
		int p = 0;
		while(m1!=7) {
			m1=cin.nextInt();
			switch(m1) {
			case 1:
				double r;				
				System.out.println("请输入半径：");
				r=cin.nextDouble();
				Yuan y = new Yuan(r);
				sum += y.getArea();
				y.javaOut();
				a += 1;
				show();
				break;
			case 2:
				double c,k;
				System.out.println("请分别输入长和宽：");
				c = cin.nextDouble();
				k = cin.nextDouble();
				JvXing jx = new JvXing(c, k);
				sum += jx.getArea();
				jx.javaOut();
				b += 1;
				show();
				break;
			case 3: 
				double c1,k1,g1;
				System.out.println("请分别输入长宽高：");
				c1 = cin.nextDouble();
				k1 = cin.nextDouble();
				g1 = cin.nextDouble();
				ChangFangTi cft = new ChangFangTi(c1, k1, g1);
				sum += cft.getArea();
				cft.javaOut();
				d += 1;
				show();
				break;
			case 4: 
				double r1,h1;				
				System.out.println("请分别输入半径和高：");
				r1 = cin.nextDouble();
				h1 = cin.nextDouble();
				YuanZhuTi yzt = new YuanZhuTi(r1, h1);
				sum += yzt.getArea();
				yzt.javaOut();
				p += 1;
				show();
				break;
			case 5: 
				System.out.println("创建了"+a+"个圆形");
				System.out.println("创建了"+b+"个矩形");
				System.out.println("创建了"+d+"个长方体");
				System.out.println("创建了"+p+"个圆柱体");
				show();
				break;
			case 6:
				System.out.println("各图形面积之和="+sum);
				show();
				break;
			case 7:
				break;
			
			}
		}cin.close();
	}

	
}

Yuan:

java">package ch11_03_02;

import ch11_03.ICalculate;

public class Yuan implements ICalculate {
	
	private double r;
	public Yuan(double r) {
		this.r =r;
	}

	@Override
	public double getArea() {
		return Math.PI*r*r;
	}

	@Override
	public void javaOut() {
		System.out.println("圆信息：半径="+r+"  面积="+getArea());

	}

}

YuanZhuTi: 

java">package ch11_03_02;

import ch11_03.ICalculate;

public class YuanZhuTi implements ICalculate {
	
	private double r;//半径
	private double h;//高
	
	

	public YuanZhuTi(double r, double h) {
		this.r = r;
		this.h = h;
	}

	@Override
	public double getArea() {
		return Math.PI*r*r*2+2*Math.PI*h;
	}

	@Override
	public void javaOut() {
		System.out.println("圆柱体信息：半径="+r+"  高="+h+"  面积="+getArea());

	}

}