JFrame和JDialogs有时会在其父窗口的后面打开，但具有焦点 [英] JFrames and JDialogs sometimes open up behind their parent windows but have focus

问题描述

我们正在开发具有以下功能的大型Java企业应用程序: 传统的Swing客户端.

We are developing a rather big Java enterprise application with a traditional Swing client.

我们时不时地遇到一个问题，即随机的JDialogs和JFrames打开并获得焦点，但隐藏在其父窗口的后面.

Every now and then, we facing the problem that random JDialogs and JFrames open up and getting the focus, but are hidden behind their parent windows.

不幸的是，这种现象是不可重现的，有时会发生. 到目前为止，在安装了Win7和WinXP的计算机上已识别出该错误. 由于所有开发人员都在运行Windows操作系统，所以这不一定意味着此问题特定于Windows.

Unfortunately, this phenomenon is not reproducible and happens on occasion. So far it was recognized on machines having Win7 and WinXP installed. Since all developers running Windows operating systems, that does not necessarily mean that this problem is specific to Windows.

我不知道如何解决该问题. 也许那里有Swing专家可以解决此问题? (我们仍在使用Java 6).

I have no idea how to fix the problem. Maybe there is a Swing expert out there who can fix this? (We are still on with Java 6).

推荐答案

JFrame不应具有父级"，因为它们是应用程序的最父级"窗口.如果您有一个窗口要作为子"窗口，因此要在另一个窗口之上，那么它应该是一个对话框(例如JDialog或JOptionPane)，并应相应地设置其父窗口.

JFrames should not have "parents" as they are meant to be the "parent-most" window of an application. If you have a window that is meant to be a "child" and is therefore meant to be above another window, then it should be a dialog such as a JDialog or JOptionPane and should have its parent window set accordingly.

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