.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

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);
}
}