java 如何更改 JButton 的图像？
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How to change the image of a JButton?
提问by user69514
I'm working on a memory game program. I have 30 JButtons on a JPanel. When the user is clicking and finds a match (meaning two buttons with the same image) I want to change the image on the JButton to a different image. However this does not happen while the program is running.
我正在开发一个记忆游戏程序。我在 JPanel 上有 30 个 JButton。当用户单击并找到匹配项（意味着具有相同图像的两个按钮）时，我想将 JButton 上的图像更改为不同的图像。但是，这不会在程序运行时发生。
How can I do this?
我怎样才能做到这一点？
I was doing this:
我是这样做的：
cards[i].setIcon(cardBack);
where cardBack is an ImageIcon that I already have.
其中 cardBack 是我已经拥有的 ImageIcon。
回答by Ahmad Vatani
you can use this code:
您可以使用此代码：
Icon i=new ImageIcon("image.jpg");
jButton1.setIcon(i);
Icon i=new ImageIcon("image.jpg");
jButton1.setIcon(i);
and copy your image (image.jpg) to your project folder!
并将您的图像 (image.jpg) 复制到您的项目文件夹中！
回答by Bluedevil678
Use a JToggleButton. More specifically, use the setIcon and setSelectedIcon methods. Using this approach, you'll avoid reinventing the wheel.
使用 JToggleButton。更具体地说，使用 setIcon 和 setSelectedIcon 方法。使用这种方法，您将避免重新发明轮子。
Example:
例子：
import java.awt.FlowLayout;
import javax.swing.JFrame;
import javax.swing.JToggleButton;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
final class JToggleButtonDemo {
public static final void main(final String[] args) {
SwingUtilities.invokeLater(new Runnable(){
@Override
public void run() {
createAndShowGUI();
}
});
}
private static final void createAndShowGUI(){
final JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new FlowLayout()); // For presentation purposes only.
final JToggleButton button = new JToggleButton(UIManager.getIcon("OptionPane.informationIcon"));
button.setSelectedIcon(UIManager.getIcon("OptionPane.errorIcon"));
frame.add(button);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
