JAVA 数学计算

package basic.day08;

public class Point {
  int x;
  int y;
  public Point(int x,int y){
    this.x=x;
    this.y=y;
  }
  public Point(int x){
//    this.x=x;
//    this.y=x;
    this(x,x);
  }
  public double distance(){
    return Math.sqrt(this.x*this.x+this.y*this.y);
  }
  public double distance(int x,int y){
    return Math.sqrt((this.x-x)*(this.x-x)+(this.y-y)*(this.y-y));
  }
  public double distance(Point other){
    return Math.sqrt((x-other.x)*(x-other.x)+(this.y-other.y)*(this.y-other.y));
  }
}