10.4(MyPoint类)设计一个名为MyPoint的类

设计一个名为MyPoint的类，表示一个带x坐标和y坐标的点。该类包括：（1）两个带get方法的数据域x和y，分别表示它们的坐标；

Java源代码：

class MyPoint{
    private double x;
    private double y;

    public double getX() {
        return x;
    }

    public void setX(double x) {
        this.x = x;
    }

    public double getY() {
        return y;
    }

    public void setY(double y) {
        this.y = y;
    }

    public MyPoint(double x, double y){
        this.x = x;
        this.y = y;

    }
    public MyPoint(){
        this.x = 0;
        this.y = 0;
    }

    private double dis = Math.sqrt(this.x*this.x+this.y+this.y);

    public double distan(){
        return dis;

    }
    public double distan(double x ,double y){
        return Math.sqrt((this.x-x)*(this.x-x)+(this.y-y)*(this.y-y));
    }

    public double distan(MyPoint a){
        return Math.sqrt((this.x-a.x)*(this.x-a.x)+(this.y-a.y)*(this.y-a.y));
    }


}
public class _104Mypoint {
    public static void main(String[] args) {
        MyPoint a = new MyPoint();
        MyPoint b = new MyPoint(10,30.5);
        System.out.println(a.distan(b));
    }
}