package testmypoint;
class MyPoint{
private double x;
private double y;
public MyPoint()//默认值
{
x=0;
y=0;
}
public MyPoint(double x,double y)
{
this.x=x;
this.y=y;
}
public double distance(MyPoint m)//给一个点
{
double a=Math.sqrt((this.x-m.x)*(this.x-m.x)+(this.y-m.y)*(this.y-m.y));
return a;
}
public double distance(double x,double y)//给出坐标
{
double a=Math.sqrt((this.x-x)*(this.x-x)+(this.y-y)*(this.y-y));
return a;
}
}
public class TestMyPoint //测试类（（10,30.5）到（0,0）的距离）
{
public static void main(String[] args) {
MyPoint a1=new MyPoint();
MyPoint a2=new MyPoint(10,30.5);
System.out.printf("%.2f\n",a1.distance(a2));
System.out.printf("%.2f\n",a1.distance(10, 30.5));
}
}原文：https://blog.51cto.com/14233078/2407562