java7 swing 中使用 openjdk 1.7 的潜在错误。0_101

Question

当使用 JDialog 的 dispose() 方法时，第一个 JDialog 关闭时我得到两个 windowClosed 事件，对于后续的 JDialog，我得到每个 先前关闭的 JDialog 的额外关闭事件（为新的 JDialog 添加两个）。

我的代码有问题吗（在下面发布）？

package main;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;

import javax.swing.JButton;
import javax.swing.JDialog;

public class Main
{

    public static void main(String[] args) throws InterruptedException
    {
        JDialog dialog;
        while (true)
        {
            dialog = createDialog();
            while (dialog.isVisible())
            {
                Thread.sleep(10);
            }
        }
    }

    public static JDialog createDialog()
    {
        final JDialog dialog = new JDialog();

        JButton close = new JButton("Close");
        dialog.add(close);

        final WindowListener windowListener = new WindowListener() {

            @Override
            public void windowOpened(WindowEvent e) {
                System.err.println("windowOpened " + dialog.hashCode());
            }

            @Override
            public void windowIconified(WindowEvent e) {
                System.err.println("windowIconified " + dialog.hashCode());
            }

            @Override
            public void windowDeiconified(WindowEvent e) {
                System.err.println("windowDeiconified " + dialog.hashCode());
            }

            @Override
            public void windowDeactivated(WindowEvent e) {
                System.err.println("windowDeactivated " + dialog.hashCode());
            }

            @Override
            public void windowClosing(WindowEvent e) {
                System.err.println("windowClosing " + dialog.hashCode());
            }

            @Override
            public void windowClosed(WindowEvent e) {
                System.err.println("windowClosed " + dialog.hashCode());

                // uncommenting this provides a fix to the bug
                // dialog.removeWindowListener(this);
            }

            @Override
            public void windowActivated(WindowEvent e) {
                System.err.println("windowActivated " + dialog.hashCode());
            }
        };

        close.addActionListener(new ActionListener()
        {
            @Override
            public void actionPerformed(ActionEvent e) {
                dialog.setVisible(false);
                dialog.dispose();
            }
        });

        dialog.addWindowListener(windowListener);

        dialog.pack();
        dialog.setVisible(true);
        return dialog;
    }
}

关闭一个 JDialog 框后此代码的示例输出：

windowOpened 1479616934
windowActivated 1479616934
windowDeactivated 1479616934
windowClosed 1479616934
windowClosed 1479616934
windowOpened 1514973352
windowActivated 1514973352

关闭第二个 JDialog 框后的示例输出：

windowClosed 1514973352
windowClosed 1479616934
windowClosed 1514973352
windowOpened 78938440
windowActivated 78938440

受影响的版本：OpenJDK 1.7.0_101，但不影响 OpenJDK 1.8.0_91
受 JRE 影响但不受 Javac 影响

Answer 1

对话框将链接到它的所有者，如果在创建对话框时没有指定所有者，这会影响对话框的行为，如您所见。最好始终将您的对话与适当的所有者（或与正确转换的 null）相关联以获得最佳行为。

java7 swing 中使用 openjdk 1.7 的潜在错误。0_101

potential bug in java7 swing using openjdk 1.7.0_101

java

swing

debugging

jdialog

openjdk