一个 JFrame 打开另一个 JFrame
我有一个 JFrame 和 JPanel,里面装满了带有动作监听器的Jsomethings。当用户单击一个对象时,我想打开另一个 JFrame。这是我所做的:
public void actionPerformed(ActionEvent e) {
Object source = e.getSource();
if (source == rejectionbutton){
RejectApp ra = new RejectApp();
ra.main(null);
}
}
(RejectApp 调用一个新的 JFrame。)因此屏幕上会打开另一个 JFrame,其中包含更多选项。它工作正常(到目前为止),但我想知道这是标准吗?我的意思是像这样调用main方法? 另一个问题是,在不使用卡片布局(我不想使用)的情况下,通过执行此类操作是处理多个面板的最佳方法吗?
I have a JFrame and JPanel full of Jsomethings with an actionlistener. When the user clicks an object I want to open another JFrame. Here is what I did:
public void actionPerformed(ActionEvent e) {
Object source = e.getSource();
if (source == rejectionbutton){
RejectApp ra = new RejectApp();
ra.main(null);
}
}
(RejectApp calls a new JFrame.) So another JFrame opens on the screen with more options. It works OK (so far), but I want to know is this standard? I mean calling the main method like this?
Another question is, without using a cardlayout (which I don't want to use), is the best way to handle multiple panels, by doing this sort of thing?
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我会改变一些事情。首先,应用程序通常有一个 JFrame,然后如果需要显示另一个窗口,则可以将其作为模态或非模态对话框,例如可以通过 JDialog 或 JOptionPane 获得。话虽如此,更常见的是拥有一个 JFrame 并在 JFrame 中交换“视图”——通过 CardLayout 交换 contentPanes 或其他大型面板,因为这会模仿我们当前使用的许多 gui 程序的行为。
就我个人而言,我还尝试将 GUI 创建转向创建 JPanel 或 JComponent,而不是创建顶级窗口。这样,如果我想将 GUI 显示为独立应用程序、对话框或小程序,我可以将其分别弹出到 JFrame 或 JDialog 或 JApplet 的 contentPane 中,或者如果作为更复杂 GUI 的内部面板,则将其插入那里,或者插入具有交换视图的应用程序中,然后作为 CardLayout 中的卡片,如上所述。最重要的是,我认为这种结构为开发人员提供了更多如何使用此 GUI 的选择。
另外,我会避免像您所做的那样调用另一个类的 main (假设这是 public static void main 方法),因为您会失去 OOP 的所有好处。您似乎还试图以非静态方式调用静态方法(假设我正确理解您的程序结构)。
对于你的第二个问题,它引出了我自己的一个问题:为什么你不想使用 CardLayout?
编辑:我的意思的一个例子如下:
I would change a few things. First off, usually an application has one JFrame and then if it needs to show another window does so as a modal or non-modal dialog such as can be obtained with a JDialog or JOptionPane. Having said that, it's even more common to have one JFrame and swap "views" in the JFrame -- swap contentPanes or other large panels via a CardLayout as this would mimic the behavior of many gui programs we all currently use.
Personally, I also try to gear my GUI creation towards creating a JPanel or JComponent rather than towards creating a top-level window. This way if I want to display the GUI as a stand alone app, a dialog, or an applet I can pop it into the contentPane of a JFrame or JDialog or JApplet respectively, or if as an inner panel of a more complex GUI, then insert it there, or in an application with a swapping view, then as a card in a CardLayout as noted above. The bottom line is I feel that this structure gives you the developer a lot more options in how you can use this GUI.
Also, I would avoid calling another class's main as you're doing (assuming this is the public static void main method) as you lose all benefits of OOPs. You also seem to be trying to call a static method in a non-static way (assuming I understand your program structure correctly).
For your second question, it begs a question of my own: why do you not want to use CardLayout?
edit: an example of what I meant is as follows:
我宁愿创建一个 JFrame 或子类的新实例,或者调用一个创建新 JFrame 的新方法:
}
另一个简单的布局管理器是 BorderLayout,它是 JFrame 类的默认布局管理器。
I would rather make a new instance of JFrame or a subclass, or call a new method who makes a new JFrame:
}
Another simple Layout-Manager is the BorderLayout, it´s the default Layout-Manager of the JFrame class.
将 YourJFrameNameHere 替换为 JFrame 名称。
很简单,不是吗?
Replace YourJFrameNameHere with the JFrame name.
Simple, no?