java - 为什么关闭一个 jframe 窗口时其他窗口会自动关闭？

Question

登录后我正在开发基于 Swing 的应用程序，我有一个菜单窗口，其中包含不同的选项卡，这些选项卡打开不同的窗口，但是当我关闭其中一个选项卡时，会自动关闭所有窗口。请指导我如何解决这个问题？谢谢。

Answer 1

您正在调用 setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE)，因此当此窗口关闭时，您的整个应用程序将关闭。这是因为(如下所述)System.exit(); 将被调用。

您应该根据应用程序的需要将其他值之一传递给 setDefaultCloseOperation(int operation)。

无论如何请阅读The Use of Multiple JFrames, Good/Bad Practice?如果您使用多个框架。

<小时/>

来源setDefaultCloseOperation

public void setDefaultCloseOperation(int operation)

Sets the operation that will happen by default when the user initiates a "close" on this frame. You must specify one of the following choices:

• DO_NOTHING_ON_CLOSE (defined in WindowConstants): Don't do anything; require the program to handle the operation in the windowClosing method of a registered WindowListener object.

• HIDE_ON_CLOSE (defined in WindowConstants): Automatically hide the frame after invoking any registered WindowListener objects.

• DISPOSE_ON_CLOSE (defined in WindowConstants): Automatically hide and dispose the frame after invoking any registered WindowListener
  objects.

• EXIT_ON_CLOSE (defined in JFrame): Exit the application using the System exit method. Use this only in applications.

The value is set to HIDE_ON_CLOSE by default. Changes to the value of this property cause the firing of a property change event, with property name "defaultCloseOperation".