point.java

（1） 实现一个Point类

 //import java.Math;
  package p1;

public class point{ 

   public int x,y;
   public point() { x=0;y=0;
	}
	public point(int x,int y){
		this.x=x;
		this.y=y;
	}
	public int getx(){
		return x;
	}
	public int gety(){
		return y;
	}
     public double distance(point p){
		 double d;
		 d=Math.sqrt((this.x-p.x)*(this.x-p.x)+(this.y-p.y)*(this.y-p.y));
		 return d;
	 }

}