Java如何使用GUI顯示不同的形狀？

在Java的GUI程式設計中，如何使用GUI顯示不同的形狀？

以下範例演示如何使用Arc2D，Ellipse2D，Rectangle2D，RoundRectangle2D類顯示不同的形狀。

package com.yiibai;

import java.awt.Shape;
import java.awt.geom.*;

public class DisplayDifferentShapes {
    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!");
    }
}

上述程式碼範例將產生以下結果。

Different shapes are created!