java Math.abs和Math.sqrtclass Line{double p1x;double p2x;double p1y;double p2y;public Line(double p1x,double p1y,double p2x,double p2y){this.p1x=p1x;this.p2x=p2x;this.p1y=p1y;this.p2y=p2y;}public String toString(){return "(" + p1x + "," + p1y + ")-(
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