rectangle.java

此程序可实现：在可视化界面中随即生成一些图形（长方形、椭圆、圆、正方形）；程序会自动告诉你所生成的图形的形状并计算这些图形的面积；最后程序会自动统计各个图形的分布。

import java.util.ArrayList;

/**
 * A class extends GeometricShape to creat rectangles.
 * 
 * @author Ruixiao Wu.
 * @version 1.0 26/06/2006.
 */
public class Rectangle extends GeometricShape {

	final int numOfRandom = 2;

	final int maxRange = 10;

	int area;

	int perimeter;

	ArrayList<Integer> RecList = new ArrayList<Integer>();

	/**
	 * A method to decide how many rectangles are going to created.
	 */
	public int numOfRec() {
		return (int) (Math.random() * 3);
	}

	/**
	 * A method to initial the parameter of the rectangles and store them into
	 * an ArrayList.
	 */
	public void initList() {
		RecList = super.randomNum(numOfRandom, maxRange);
	}

	/**
	 * A method to check if the rectangle is a square.
	 */
	public boolean checkParam() {
		if(RecList.get(0) == RecList.get(1))
			return false;
		else
			return true;
		}

	

	/**
	 * A method to caculate the area of rectangle.
	 */
	@Override
	void calculateArea() {
		area = RecList.get(0) * RecList.get(1);
	}

	/**
	 * A getter method to get the area of rectangle.
	 */
	public int getArea() {
		return area;
	}

	/**
	 * A method to caculate the perimeter of rectangle.
	 */
	@Override
	void calculatePerimeter() {
		perimeter = 2 * (RecList.get(0) + RecList.get(1));
	}

	/**
	 * A getter method to get the perimeter of rectangle.
	 */
	public int getPerimeter() {
		return perimeter;
	}

}//End class Rectangle