使用虚线,线程(或Swing Timer)&将它们与repaint()结合起来,并对破折号的起点和终点进行一些调整 – 然后就可以了.

例

package test;

import java.awt.BasicStroke;

import java.awt.Color;

import java.awt.Graphics2D;

import java.awt.Shape;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.geom.Rectangle2D;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.IOException;

import javax.imageio.ImageIO;

import javax.swing.ImageIcon;

import javax.swing.JLabel;

import javax.swing.JOptionPane;

import javax.swing.SwingUtilities;

import javax.swing.Timer;

public class AnimatedStroke {

public static void main(String[] args) {

SwingUtilities.invokeLater(new Runnable() {

public void run() {

BasicStroke dashedStroke;

final int width = 100;

final int height = 30;

final BufferedImage image = new BufferedImage(

width,height,BufferedImage.TYPE_INT_ARGB);

final JLabel label = new JLabel(new ImageIcon(image));

int pad = 5;

final Shape rectangle = new Rectangle2D.Double(

(double)pad,(double)pad,

(double)(width-2*pad),

(double)(height-2*pad));

ActionListener listener = new ActionListener() {

float dashPhase = 0f;

float dash[] = {5.0f,5.0f};

@Override

public void actionPerformed(ActionEvent ae) {

dashPhase += 9.0f;

BasicStroke dashedStroke = new BasicStroke(

1.5f,

BasicStroke.CAP_ROUND,

BasicStroke.JOIN_MITER,

1.5f, //miter limit

dash,

dashPhase

);

Graphics2D g = image.createGraphics();

g.setColor(Color.WHITE);

g.fillRect(0,0,width,height);

g.setColor(Color.BLACK);

g.setStroke(dashedStroke);

g.draw(rectangle);

g.dispose();

label.repaint();

/*

if (dashPhase<100f) {

try {

ImageIO.write(

image,

"PNG",

new File("img" + dashPhase + ".png"));

} catch(IOException ioe) {

// we tried

}

}*/

}

};

Timer timer = new Timer(40, listener);

timer.start();

JOptionPane.showMessageDialog(null, label);

}

});

}

}