我正在用Java训练,特别是GUI(Swing和AWT),但是我在JButton中遇到了icon的问题。图像没有显示,要使其可见,我必须调整窗口大小,我该怎么办?
这是代码:
public class MainWindow extends JFrame implements WindowListener, KeyListener, ActionListener, FocusListener, MouseListener{
private final String APPLICATION_NAME = "GUI";
private final String APPLICATION_VERSION = "0.0.1";
private final JButton btnCiao;
JPanel panel = new JPanel();
JPanel panel2 = new JPanel();
public MainWindow(){
super();
this.setTitle(APPLICATION_NAME + " " + APPLICATION_VERSION);
this.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
this.addWindowListener(this);
Dimension dimension = Toolkit.getDefaultToolkit().getScreenSize();
setLocation((int)(dimension.getWidth()/2-getWidth()/2), (int)(dimension.getHeight()/2-getHeight()/2));
this.setVisible(true);
setMinimumSize(new Dimension(600,600));
add(panel);
btnCiao = new JButton("WAU");
panel.add(btnCiao);
JButton imageButton = new JButton();
try{
Image img = ImageIO.read(getClass().getResource("Nike.jpg"));
Image img2 = ImageIO.read(getClass().getResource("Adidas.jpg"));
imageButton.setIcon(new ImageIcon(img));
imageButton.setPressedIcon(new ImageIcon(img2));
} catch(IOException ex){}
// to remove the border
imageButton.setBorder(null);
panel.add(imageButton);
}
}
添加
JButton
后,您需要在JFrame
上调用revalidate()
方法。
更改会影响其外观的组件的属性时,应调用此方法。
Swing GUI 中 validate()、revalidate() 和 invalidate() 之间的区别