?? mypanel.java
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package usestroke;import java.awt.*;import javax.swing.JPanel;import java.awt.geom.*;/** * Title: * Description: * Copyright: Copyright (c) 2001 * Company: * @author * @version 1.0 */public class MyPanel extends JPanel { BorderLayout borderLayout1 = new BorderLayout(); private Ellipse2D.Double circle = new Ellipse2D.Double(10, 10, 350, 350); private GradientPaint gradient = new GradientPaint(0, 0, Color.red, 175, 175, Color.yellow,true); public MyPanel() { try { jbInit(); } catch(Exception ex) { ex.printStackTrace(); } } void jbInit() throws Exception { this.setLayout(borderLayout1); } public void paintComponent(Graphics g) { clear(g); Graphics2D g2d = (Graphics2D)g; g2d.setPaint(gradient); g2d.fill(circle); g2d.setColor(Color.blue); g2d.setStroke(new BasicStroke(1)); g2d.draw(circle); for(int i=9;i>0;i--){ g2d.setStroke(new BasicStroke(i)); g2d.draw(new Ellipse2D.Double(10+i*20, 10+i*20, 350-i*30, 350-i*30)); } } protected void clear(Graphics g) { super.paintComponent(g); }}?? 快捷鍵說明
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