testshape.java

JAVA写的一个有关求解形状:正方形,圆等面积的类

public class TestShape
{
	public static void main(String args[])
	{
  		Circle c = new Circle(1);  //圆
  		c.CalcArea();
  		c.printArea();

 		RectAngel a = new RectAngel(1,2); //长方形
  		a.CalcArea();
  		a.printArea();

  		Square s = new Square(10);  //正方形
  		s.CalcArea();
  		s.printArea();
  
  		Sphere sp = new Sphere(10);  //正方体
  		sp.CalcArea();
  		sp.printArea();
 
	}
}

abstract class Shape {
 double radius;
 double chang;
 double kuan;
 double area;
 abstract void CalcArea();
}

class Circle extends Shape
{
	Circle(double r)
	{
  		radius = r; 
 	}
 	void CalcArea()
 	{
  		area = 3.14*radius*radius;
 	}

 	void printArea()
 	{
  		System.out.println("圆的面积为：");
  		System.out.println(area);
 	}
}

class RectAngel extends Shape
{
	RectAngel(double a, double b)
	{
  		chang = a;
  		kuan = b; 
 	}
 	void CalcArea()
 	{
 		area = chang * kuan;
 	}

	void printArea()
	{
  		System.out.println("长方形的面积为：");
  		System.out.println(area);
 	}
}

class Square extends Shape
{
	Square(double a)
 	{
  		radius = a; 
 	}
 	void CalcArea()
 	{
  		area = radius * radius;
 	}

	void printArea()
	{
		System.out.println("正方形的面积为：");
  		System.out.println(area);
 	}
}


class Sphere extends Shape
{
	Sphere(double a)
 	{
  		radius = a; 
 	}
	void CalcArea()
 	{
  		area = radius * radius * radius;
 	}

 	void printArea()
 	{
  		System.out.println("正方体体积为：");
  		System.out.println(area);
 	}
}