class MySubLine extends MyPoint {
    public MyPoint startpt,endpt;

    public MySubLine() {
        this.startpt = new MyPoint();
        this.endpt = new MyPoint();
    }

    public MySubLine(int x1,int y1,int x2,int y2) {
        this.startpt=new MyPoint(x1,y1);
        this.endpt=new MyPoint(x2,y2);
    }

    public MySubLine(MyPoint firstPoint, MyPoint secondPoint) {
        this.startpt = firstPoint;
        this.endpt = secondPoint;
    }

    public MyPoint getStartPt() {
        return startpt;
    }

    public MyPoint getEndPt() {
        return endpt;
    }

    public void setEndPt(MyPoint endpt){
        this.endpt = new MyPoint(x,y);
    }

    public void setStartPt(MyPoint startpt){
        this.startpt = new MyPoint(x,y);
    }
    public double getLength() {
        return Math.abs(Math.sqrt(((startpt.x-endpt.x)*(startpt.x-endpt.x))+((startpt.y-endpt.y)*(startpt.y-endpt.y))));
    }

    public String toString()    {
        return("("+this.startpt.x+", "+this.startpt.y+") to ("+this.endpt.x+", "+this.endpt.y+")");
    }
}