我是新来的。我一直在想我的代码出了什么问题。我有两个jframe,一个是我的主框架,另一个类似于"视图细节"框架,当你点击主框架中的选定数据时。这是我的主类看起来像:
public class MainClass{
private JFrame frame;
private JButton btnNewButton;
private String testData;
private DetailClass detail;
public JFrame getFrame() {
return frame;
}
public String getTest() {
return testData;
}
public void setTest(String test) {
this.testData = test;
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
main window = new main();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public MainClass() {
initialize();
}
private void initialize() {
//some codes label, button, etc.
btnNewButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
setTest("Data retrieved from main");
detail.getFrame().setVisible(true);
}
});
detail = new DetailClass();
detail.setMainClass(this);
}
}
这里是我的DetailClass我想在这里显示从main获得的数据。公共类DetailClass(){private MainClass main;private JFrame;
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
DetailClass window = new DetailClass ();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public DetailClass() {
initialize();
}
public void initialize(){
//some codes for frame
//this is where I test if the detail class receives the data
System.out.println(main.getTest());
}
public void setMainClass(MainClass m){
this.main = m;
}
}
就是这样,main.getTest()似乎在initialize()中不起作用,但我试图将其放在鼠标事件中,每当我单击第2帧中的按钮时,它就可以正常工作。似乎只有当帧已经可见/激活/完成渲染时才有效,但它不会在初始化中工作,我需要它在帧2中预加载数据。我希望你们能帮我。:)
如果没有有效的Minimal, Complete和Verifiable示例,我们只能猜测您可能做错了什么,但我猜other()
方法,即您显示主文本的方法,只被调用一次,在创建第二个JFrame时,在文本更改之前。这里的解决方案如注释中所述——通过方法或构造函数参数将信息从一个类传递到另一个类,并在需要时传递该信息,而不仅仅是在程序启动时。
正如在注释中所指出的,第二个对话框窗口应该是JDialog,而不是JFrame(应用程序窗口)。
例如:import java.awt.Dialog.ModalityType;
import java.awt.Dimension;
import java.awt.Window;
import java.awt.event.ActionEvent;
import javax.swing.*;
public class TwoWindows {
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> createAndShowGui());
}
private static void createAndShowGui() {
MainGui mainPanel = new MainGui();
mainPanel.setPreferredSize(new Dimension(400, 250));
JFrame frame = new JFrame("Main GUI");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.add(mainPanel);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
class MainGui extends JPanel {
private SubWindow subWindow = new SubWindow();
private JDialog dialog;
private JTextField textField = new JTextField("Text in field", 10);
public MainGui() {
add(textField);
add(new JButton(new ShowDetailAction("Show Detail")));
}
private class ShowDetailAction extends AbstractAction {
public ShowDetailAction(String name) {
super(name);
}
@Override
public void actionPerformed(ActionEvent e) {
// if dialog not yet created -- create it
if (dialog == null) {
Window win = SwingUtilities.getWindowAncestor(MainGui.this);
dialog = new JDialog(win, "Details Window", ModalityType.MODELESS);
dialog.add(subWindow);
dialog.pack();
dialog.setLocationRelativeTo(win);
}
String text = textField.getText();
subWindow.passText(text);
dialog.setVisible(true);
}
}
}
class SubWindow extends JPanel {
private JLabel textLabel = new JLabel(" ");
public SubWindow() {
setPreferredSize(new Dimension(300, 60));
add(new JLabel("Details:"));
add(textLabel);
}
public void passText(String text) {
textLabel.setText(text);
}
}