Swing 动态错误提示框
最近写了个swing 动态提示错误的提示框，本来想放在项目中的，被否掉了，拿出来共享一下，共同提高：
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package errborder;import java.awt.AlphaComposite;import java.awt.Color;import java.awt.Component;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.Insets;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JFrame;import javax.swing.JTextField;import javax.swing.Timer;import javax.swing.border.AbstractBorder;public class BlinkErrorBorder extends AbstractBorder implements ActionListener{private int thickness = 5;private float alpha = thickness;private Color color = Color.RED;private Timer timer ;private AlphaComposite composite;private final float[] blinkArray = new float[]{1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, -1.0f,-1.0f,-1.0f,-1.0f,-1.0f,-1.0f,-1.0f};public BlinkErrorBorder(Color color, int thickness){this.color = color;this.thickness = thickness;this.alpha = thickness;composite = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 1.0f);timer = new Timer(120, this);}public void startBlink(){timer.start();}public void stopBlink(){timer.stop();}/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubJFrame frame = new JFrame();BlinkErrorBorder err = new BlinkErrorBorder(Color.RED,3);JTextField text = new JTextField();text.setBorder(err);err.startBlink();frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.getContentPane().add(text);frame.setSize(400,400);frame.setVisible(true);} public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {Graphics2D g2d = (Graphics2D) g.create();g2d.setColor(color);for(int i = 0; i < thickness; i++) {composite = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, (thickness-i)/alpha);g2d.setComposite(composite);g2d.drawRoundRect(x+i, y+i, width-i-i-1, height-i-i-1, thickness, thickness);}c.repaint(); } public Insets getBorderInsets(Component c) { return new Insets(thickness, thickness, thickness, thickness); } int tempI = 0;@Overridepublic void actionPerformed(ActionEvent e) {alpha = alpha+blinkArray[tempI];tempI++;tempI = tempI%(blinkArray.length);}}?