如何使用GUI显示不同的形状？（How to display different shapes using GUI?）

问题描述 (Problem Description)

如何使用GUI显示不同的形状？

解决方案 (Solution)

下面的示例演示如何使用Arc2D，Ellipse2D，Rectangle2D，RoundRectangle2D类显示不同的形状。

import java.awt.Shape;
import java.awt.geom.*;
public class Main {
   public static void main(String[] args) {
      int x1 = 1, x2 = 2, w = 3, h = 4, 
      x = 5, y = 6, 
	   y1 = 1, y2 = 2, start = 3;
      Shape line = new Line2D.Float(x1, y1, x2, y2);
      Shape arc = new Arc2D.Float(x, y, w, h, start, 1, 1);
      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, 1, 2);
      System.out.println("Different shapes are created:");
   }
}

结果 (Result)

上面的代码示例将产生以下结果。

Different shapes are created.