point2d.java

java入门级程序 类及继承

package tree.point2d;

public class Point2D
{
	public  int x,y;
	public Point2D ( )
	{
		x=0;
		y=0;
	}
	public Point2D ( int xx, int yy )
	{
		x=xx;
		y=yy;
	}
	public void offset(int a, int b)
	{
		x=x+a;
		y=y+b;
	}
	public double dis ( Point2D p )
	{
		double d;
		d = (x-p.x)*(x-p.x)+(y-p.y)*(y-p.y);
		d = Math.sqrt(d);
		return d;
	}
};