求高手用JAVA帮我设计一个完整的Point类，可以计算两点之间距离和中间点坐标的，万分感谢！

你好，程序如下：

public class Point {

double x1,x2,y1,y2;
double d,x3,y3;
Point(double x1,double y1,double x2,double y2){//构造方法
this.x1 = x1;
this.x2 = x2;
this.y1 = y1;
this.y2 = y2;
}
void TestPoint(){//求距离和中点坐标
x3 = (x1 + x2)/2;
y3 = (y1 + y2)/2;
d = Math.sqrt((x1 - x2)*(x1 - x2) + (y1 - y2)*(y1 - y2));

System.out.println("(" + x3 + ","+ y3 + ")");
System.out.println(d);
}

public static void main(String[] args) {
Point p = new Point(1,1,2,2);
p.TestPoint();

}

}
如果还有其他要求的话，我再改进一下。

public class point{
private double x;
private double y;
point(double x,double y) {this.x = x;this.y = y;}
void center(point a,point b){
double resx,resy;
resx = (a.x+b.x)/2;
resy = (a.y+b.y)/2;
System.out.println(输出结果);
}
void distance(point a ,point b){
double res;
res = Math.sqrt(Math.pow(a.x-b.x,2)+Math.pow(a.y-b.y,2));
System.out.println(结果);
}
}

主函数不写了，就创建两个point对象调用两个方法就行 像这么创建对象：point a = new point(1,2)
直接写的 没编译，意思都有了 看着改改就好