在 java/swing 中关闭窗口时采取的正确操作是什么? [英] What is the right action to take upon closing windows in java/swing?
问题描述
我刚刚在我的 CustomUIPanel 类中编写了此测试代码:
I just wrote this test code in my CustomUIPanel class:
public static void main(String[] args) {
final JDialog dialog = CustomUIPanel.createDialog(null,
CustomUIPanel.selectFile());
dialog.addWindowListener(new WindowAdapter() {
@Override public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
如果 CustomUIPanel.main()
是程序的入口点,它可以正常工作,但它让我想知道:如果另一个名为 CustomUIPanel.main()
的类用于测试?然后我对 System.exit(0)
的调用不正确.
It works correctly if CustomUIPanel.main()
is the program's entry point, but it makes me wonder something: what if another class called CustomUIPanel.main()
for testing? Then my call to System.exit(0)
is incorrect.
如果没有顶级窗口,有没有办法告诉 Swing 事件调度线程自动退出?
Is there a way to tell the Swing event dispatch thread to exit automatically if there are no top-level windows?
如果不是,如果目标是让程序在所有顶级窗口都关闭时退出,那么 JDialog/JFrame 在关闭时应该做什么?
If not, what's the right thing for a JDialog/JFrame to do upon closing if the goal is for the program to exit when all the top level windows are closed?
推荐答案
您可以使用 setDefaultCloseOperation()
JDialog
方法,指定DISPOSE_ON_CLOSE
:>
You can use the setDefaultCloseOperation()
method of JDialog
, specifying DISPOSE_ON_CLOSE
:
setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
另见 12.8 程序退出.
附录:结合@camickr 的有用答案,此示例在窗口关闭或关闭按钮被按下时退出.
Addendum: Incorporating @camickr's helpful answer, this example exits when either the window is closed or the close button is pressed.
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.WindowEvent;
import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JLabel;
/** @see http://stackoverflow.com/questions/5540354 */
public class DialogClose extends JDialog {
public DialogClose() {
this.setLayout(new GridLayout(0, 1));
this.add(new JLabel("Dialog close test.", JLabel.CENTER));
this.add(new JButton(new AbstractAction("Close") {
@Override
public void actionPerformed(ActionEvent e) {
DialogClose.this.setVisible(false);
DialogClose.this.dispatchEvent(new WindowEvent(
DialogClose.this, WindowEvent.WINDOW_CLOSING));
}
}));
}
private void display() {
this.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
this.pack();
this.setLocationRelativeTo(null);
this.setVisible(true);
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new DialogClose().display();
}
});
}
}
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