java面向对象

public class PointM {

    int x;
    int y;

    public PointMe(){

    }

    public PointMe(int xx,int yy){
        x = xx;
        y = yy;
    }

    public void show(){
        System.out.println("("  + x + "," + y + ")");
    }

    public void set(int xx,int yy){
        x = xx;
        y = yy;
    }

    public double calcInstance(Point p){
        return Math.sqrt((p.x-x)*(p.x-x) + (p.y-y)*(p.y-y));
    }

    public void changePoint(Point p){
        int do1 = p.x;
        p.x = x;
        x = do1;
        int do2 = p.y;
        p.y = y;
        y = do2;
    }

    public static void main(String[] args) {
        Point p1 = new Point();
        p1.set(3,5);
        Point p2 = new Point();
        p2.set(6,9);
        p1.show();
        p2.show();
        double result = p1.calcInstance(p2);
        System.out.println(result);
        System.out.println("两个点坐标交换之后的坐标----------");
        p1.changePoint(p2);
        p1.show();
        p2.show();
    }
}