crmain.java

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class Cpoint
{
	int x,y;
	public void setXY(int x1,int y1)
	{
		x=x1;
                y=y1;
	}
	int getX()
        {
                return x;
        }
	int getY()
        {
                return y;
        }
}
class Square extends Cpoint
{
	
    private int l;
    public void setL(int x)
    {
        l=x;
    }      
    int perimeter()
    {
        return 4*l;
    }
    int area()
    {
        return l*l;
    }
}
public class CrMain
{
	public static void main(String args[])
        {
		Square s1=new Square();
		s1.setXY(5,10);
		s1.setL(20);
		System.out.println("x="+s1.getX());
		System.out.println("y="+s1.getY());
		System.out.println("边长="+s1.perimeter());
		System.out.println("面积="+s1.area());
	}
}