.编程：编写一个Point类，有x、y两个属性。编写一个PointDemo类，并提供一个distance（Point p1，Point p2）方法用于计算两点之间的距离，实例化两个具体的Point对象

[code]package test;
import java.util.*;
public class point {
public double x;
public double y;
public point()
{

}
public point(double x1,double y1)
{

x=x1;
y=y1;
}
public void setx(double x1)
{
x=x1;
}
public void sety(double y1)
{
y=y1;
}
}
package test;
import java.util.*;
public class pointdemo {
point p1;
point p2;
public static void main(String[] args) {
// TODO 自动生成的方法存根

pointdemo p=new pointdemo();
Scanner sc=new Scanner(System.in);
System.out.println("请输入第一条边的x值");
double num1=sc.nextDouble();
System.out.println("请输入第一条边的y值");
double num2=sc.nextDouble();

System.out.println("请输入第二条边的x值");
double num3=sc.nextDouble();

System.out.println("请输入第二条边的y值");
double num4=sc.nextDouble();

point p1=new point(num1,num2);
point p2=new point(num3,num4);
pointdemo pp=new pointdemo(p1,p2);
pp.distance();

}
public pointdemo()
{

}
public pointdemo(point p1,point p2)
{
this.p1=p1;
this.p2=p2;
}

public void distance()
{
double num5=Math.sqrt((p1.x-p2.x)*(p1.x-p2.x)+(p1.y-p2.y)*(p1.y-p2.y));
System.out.println(num5);
}
}