求兩點之間的距離，類中有靜變量和靜态方法

已調試可運作，但需要改進 


package test; 


public class Point { 


double x,y; 

static double d; 

Point(double a,double b){ 

x = a; 

y = b; 

} 


void TestPoint(Point p1,Point p2){ 

x = (p1.x + p2.x)/2; 

y = (p1.y + p2.y)/2; 

System.out.println("(" + x + ","+ y + ")"); 

} 


static void distance(Point p1,Point p2){ 

d = Math.sqrt((p1.x - p2.x)*(p1.x - p2.x) + (p1.y - p2.y)*(p1.y - p2.y)); 

System.out.println(d); 

} 

public static void main(String[] args) { 


Point p1 = new Point(0,0); 

Point p2 = new Point(1,3); 

Point.distance(p1, p2); 

} 



}