很抱歉，如果已经多次询问过这个问题，但我有一个 自定义 JDialog。它被设置为具有自定义背景，并且出现在调用它的帧上，接收消息，然后在选择调用它的帧的选项时应该返回YES或NO（0或1）。
public class JYOptionPane {
@SuppressWarnings("deprecation")
public static void showJY_YES_NO_Dialog(final JFrame frame, String Question) {
darken(frame);
frame.disable();
final JDialog OptionPane = new JDialog();
OptionPane.setAlwaysOnTop(true);
OptionPane.setBounds(
(int) (frame.getX() + (frame.getSize().getWidth() / 2))
- (350 / 2), (int) (frame.getY() + (frame.getSize()
.getHeight() / 2)) - (200 / 2), 350, 200);
OptionPane.setResizable(false);
OptionPane.setUndecorated(true);
ImageIcon icon = new ImageIcon(
LoginFrame.class.getResource("/Images/bgprompt.png"));
Image backImage = icon.getImage();
ImagePanel contentPane = new ImagePanel();
contentPane.setBackgroundImage(backImage);
OptionPane.setContentPane(contentPane);
OptionPane.setBackground(new Color(0, 0, 0, 0));
JLabel lblQuestion = new JLabel(Question);
lblQuestion.setBounds(0, 40, 350, 30);
lblQuestion.setFont(new Font("Calibria", Font.PLAIN, 20));
lblQuestion.setForeground(Color.white);
lblQuestion.setHorizontalAlignment(SwingConstants.CENTER);
lblQuestion.setVerticalAlignment(SwingConstants.CENTER);
lblQuestion.setAlignmentY(JComponent.CENTER_ALIGNMENT);
OptionPane.add(lblQuestion);
JYButton btnYes = new JYButton(
new ImageIcon(LoginFrame.class.getResource("/buttons/default.png")),
new ImageIcon(LoginFrame.class.getResource("/buttons/defaultprs.png")),
new ImageIcon(LoginFrame.class.getResource("/buttons/defaulthv.png")));
btnYes.setText("Yes");
btnYes.setFont(new Font("Arial", Font.BOLD, 17));
btnYes.setForeground(Color.white);
btnYes.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
LoginFrame.setOPintNo(0);
Class<? extends JFrame> f = frame.getClass();
try {
f.newInstance().setVisible(true);
frame.dispose();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
OptionPane.dispose();
}
});
btnYes.setBounds(40, 200 / 2 - 31 / 2 + 50, 121, 31);
OptionPane.add(btnYes);
OptionPane.getRootPane().setDefaultButton(btnYes);
JYButton btnNo = new JYButton(new ImageIcon(
LoginFrame.class.getResource("/buttons/default.png")),
new ImageIcon(LoginFrame.class.getResource("/buttons/defaultprs.png")),
new ImageIcon(LoginFrame.class.getResource("/buttons/defaulthv.png")));
btnNo.setText("No");
btnNo.setFont(new Font("Arial", Font.BOLD, 17));
btnNo.setForeground(Color.white);
btnNo.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
LoginFrame.setOPintNo(1);
Class<? extends JFrame> f = frame.getClass();
try {
f.newInstance().setVisible(true);
frame.dispose();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
OptionPane.dispose();
}
});
btnNo.setBounds(189, 200 / 2 - 31 / 2 + 50, 121, 31);
OptionPane.add(btnNo);
OptionPane.setVisible(true);
}
}
我试图让它返回一个int，但它似乎无法将int赋值给变量。因此我在我的LoginFrame中创建了一个int变量（它永远不会被丢弃，只是不可见）并在那里设置它并为它创建一个Get（）函数。但是，在JDialog中进行选择后，如何让帧调用Get（）函数？必须从我作为最终JFrame帧传入的帧调用它。谢谢！
答案 0 :(得分：2)
您可能需要查看How to Use Modality in Dialogs文档。首先，您不需要将JFrame传递给您的班级，您可以简单地将其删除。看一下这个例子：
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class Demo {
private void createAndShowGUI() {
JButton button = new JButton("Show dialog");
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
MyOptionPane optionPane = new MyOptionPane();
int option = optionPane.showYesNoMessage("Close frame", "Do you really want to close the frame?");
if(option == MyOptionPane.YES) {
JButton button = (JButton)e.getSource();
SwingUtilities.getWindowAncestor(button).dispose();
}
}
});
JPanel content = new JPanel();
content.add(new JLabel("Test:"));
content.add(button);
JFrame frame = new JFrame("Demo");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(content);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public class MyOptionPane {
public static final int YES = 0;
public static final int NO = -1;
private int choice = NO;
public int showYesNoMessage(String title, String message) {
JLabel label = new JLabel(message);
JButton yesButton = new JButton("Yes");
yesButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
choice = YES;
JButton button = (JButton)e.getSource();
SwingUtilities.getWindowAncestor(button).dispose();
}
});
JButton noButton = new JButton("No");
noButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
choice = NO;
JButton button = (JButton)e.getSource();
SwingUtilities.getWindowAncestor(button).dispose();
}
});
JPanel buttons = new JPanel();
buttons.add(yesButton);
buttons.add(noButton);
JPanel content = new JPanel(new BorderLayout(8, 8));
content.add(label, BorderLayout.CENTER);
content.add(buttons, BorderLayout.SOUTH);
JDialog dialog = new JDialog();
dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
dialog.setModal(true);
dialog.setTitle(title);
dialog.getContentPane().add(content);
dialog.pack();
dialog.setLocationRelativeTo(null);
dialog.setVisible(true);
return choice;
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new Demo().createAndShowGUI();
}
});
}
}
关于使用setBounds()和@AndrewThompson总是说：
Java GUI可能必须在不同的平台上工作 屏幕分辨率＆amp;使用不同的PLAF。因此他们不是 有助于准确放置组件。组织组件 对于健壮的GUI，而是使用布局管理器或其组合 它们，以及布局填充和白色空间的边界。
因此，当您使用Swing组件时，应该完全避免使用setBounds()和set(Preferred | Minimum | Maximum)Size()。