JButton 的问题

Question

我有一些 JButton 的代码：

 solutionButton = new JButton("Solution");
 solutionButton.setBorderPainted( false);
 solutionButton.setContentAreaFilled( false );
 solutionButton.setFocusPainted( false);
 solutionButton.setFont( new Font("Arial",Font.BOLD,16));
 solutionButton.setForeground( new Color(80,21,25));
 solutionButton.setRolloverIcon( 
         new ImageIcon(getClass().getResource( "images/game.png")));
  solutionButton.setRolloverEnabled( true );
 add(solutionButton);

如果我只是简单地设置图标，它就可以正常工作，我会看到图标。如果我执行上述操作并尝试设置鼠标悬停图标，当我将鼠标悬停在按钮上时，我看不到任何图标。

我做错了什么？

谢谢

Answer 1

指向月球！

import java.awt.Image;
import javax.swing.*;
import javax.imageio.ImageIO;
import java.net.URL;

class TestRolloverIcon {

    public static void main(String[] args) throws Exception {
        URL url1 = new URL("http://pscode.org/media/citymorn1.jpg");
        URL url2 = new URL("http://pscode.org/media/citymorn2.jpg");
        final Image image1 = ImageIO.read(url1);
        final Image image2 = ImageIO.read(url2);
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                JButton button = new JButton("Point at the Moon!");
                button.setIcon(new ImageIcon(image1));
                button.setRolloverIcon(new ImageIcon(image2));

                JOptionPane.showMessageDialog(null, button);
            }
        });
    }
}

---

有没有办法在不先设置图标的情况下做到这一点，我只想要一个翻转图标而不是一个图标。

指向空间（有很多）！

import java.awt.image.BufferedImage;
import javax.swing.*;
import javax.imageio.ImageIO;
import java.net.URL;

class TestRolloverIcon {

    public static void main(String[] args) throws Exception {
        URL url2 = new URL("http://pscode.org/media/citymorn2.jpg");
        final BufferedImage image2 = ImageIO.read(url2);
        final BufferedImage image1 = new BufferedImage(
            image2.getWidth(),image2.getHeight(),BufferedImage.TYPE_INT_ARGB);
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                JButton button = new JButton("Point at space (there's a lot of it)!");
                button.setIcon(new ImageIcon(image1));
                button.setRolloverIcon(new ImageIcon(image2));

                JOptionPane.showMessageDialog(null, button);
            }
        });
    }
}