how to find the angle of 2 coordinates java

1public double getAngleFromPoint(Point firstPoint, Point secondPoint) {
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3    if((secondPoint.x > firstPoint.x)) {//above 0 to 180 degrees
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5        return (Math.atan2((secondPoint.x - firstPoint.x), (firstPoint.y - secondPoint.y)) * 180 / Math.PI);
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7    }
8    else if((secondPoint.x < firstPoint.x)) {//above 180 degrees to 360/0
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10        return 360 - (Math.atan2((firstPoint.x - secondPoint.x), (firstPoint.y - secondPoint.y)) * 180 / Math.PI);
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12    }//End if((secondPoint.x > firstPoint.x) && (secondPoint.y <= firstPoint.y))
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14    return Math.atan2(0 ,0);
15
16}//End public float getAngleFromPoint(Point firstPoint, Point secondPoint)
17