Java作业：求平面上两点间距离

public class Point {
 public double x;
 public double y;
 public Point(double x,double y){
  this.x=x;
  this.y=y;
 }
 
 public double getX(){
  return x;
 }
 
 public void setX(double x){
  this.x=x;
 }
 
 public double getY(){
  return y;
 }
 
 public void setY(double y){
  this.y=y;
 }
 public static double distance(Point a,Point b){
  double x1=a.x-b.x;
  double y1=a.y-b.y;
  return Math.sqrt(x1*x1+y1*y1);
 }
 public static Point input(Scanner sc,String s){
  System.out.println("请输入"+s+"X");
  double x=sc.nextDouble();
  System.out.println("请输入"+s+"Y");
  double y=sc.nextDouble();
  return new Point(x,y);
 }
 public static void main(String[] args){
  System.out.println("请输入2个坐标");
  Scanner sc= new Scanner(System.in);
  Point c1=input(sc,"第一个坐标");
  Point c2=input(sc,"第二个坐标");
  double c3=distance(c1,c2);
  System.out.println("("+c1.x+","+c1.y+")"+"("+c2.x+","+c2.y+")"+"之间的距离为"+c3);
 }
}