e656. 创建基本图形

Shape line = new Line2D.Float(x1, y1, x2, y2);
    Shape arc = new Arc2D.Float(x, y, w, h, start, extent, type);
    Shape oval = new Ellipse2D.Float(x, y, w, h);
    Shape rectangle = new Rectangle2D.Float(x, y, w, h);
    Shape roundRectangle = new RoundRectangle2D.Float(x, y, w, h, arcWidth, arcHeight);

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