example.java

商品交易系统

public class Example 
{
	public static void main(String[] args)
	{
		double area1,area2=0;
		Lader lader1,lader2;
		lader1=new Lader(5,10,2);
		lader2=new Lader(10,20.45,20);
		area1=lader1.computeArea();
		area2=lader2.computeArea();
		System.out.println("lader1的面积是:"+area1);
		System.out.println("lader2的面积是:"+area2);
		lader1.setAbove(10);
		lader2.setBottom(40);
		area1=lader1.computeArea();
		area2=lader2.computeArea();
		System.out.println("lader1的面积是:"+area1);
		System.out.println("lader2的面积是:"+area2);
	}

}