Swing实现动画效果

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;

/**
* @function 转动
* @time 2017年4月5日上午11:19:58
*/
public class DoRun extends JPanel {

private static final long serialVersionUID = 1L;
private final int DELAY = 50;// 转动快慢设置
private final static Long time = (long) 5000;
private static Timer timer;
private int x = 0;
/**
* 调用
*/
public static void main(String[] args) {
JFrame frame = new JFrame("正转");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new DoRun());
frame.setSize(300, 300);
frame.setLocation(400, 400);
frame.setVisible(true);
try {
Thread.sleep(time);
} catch (InterruptedException e) {
}
timer.stop();
frame.setVisible(false);
frame.dispose();

}
/**
* 面板构造函数，初始化面板。包括Timer 的场景。
*/
public DoRun() {
timer = new Timer(DELAY, new ReboundListener());
timer.start();
}

/**
* 动画效果：不断的更新图像的位置，已达到动画的效果。
*/
private class ReboundListener implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
if (x < 360) {
x = x - 20;
} else {
x = 0;
}
repaint();
}
}

/**
* 绘出图像在面板中的位置
*/
public void paintComponent(Graphics page) {
super.paintComponent(page);
drawArc(page);
}

/**
* 画图形
*/
private void drawArc(Graphics g) {
Graphics2D g2d = (Graphics2D) g.create();
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
int width = getWidth();
int height = getHeight();
g2d.setColor(Color.BLACK);
g2d.drawArc(width / 2 - 110, height / 2 - 110, 10 + 200, 10 + 200, 0, 360);
g2d.fillArc(width / 2 - 110, height / 2 - 110, 10 + 200, 10 + 200, x, 240);
g2d.setColor(Color.WHITE);
g2d.fillArc(width / 2 - 90, height / 2 - 90, 10 + 160, 10 + 160, 0, 360);
g2d.dispose();
}
}