java - 从 JTextfields 中删除焦点

Question

我有一个带有一些 JTextfields 的 JDialog，我想在打开对话框时从第一个文本字段中删除焦点。

我尝试了.removeFocus()，但是我无法再使用焦点了。我只想删除它，因此当我打开对话框时，不会选择任何文本字段。

Answer 1

来自How to use the focus subsystem我们得到以下内容:

If you want to ensure that a particular component gains the focus the first time a window is activated, you can call the requestFocusInWindow method on the component after the component has been realized, but before the frame is displayed. The following sample code shows how this operation can be done:

//...Where initialization occurs...
JFrame frame = new JFrame("Test");
JPanel panel = new JPanel(new BorderLayout());

//...Create a variety of components here...

//Create the component that will have the initial focus.
JButton button = new JButton("I am first");
panel.add(button);
frame.getContentPane().add(panel);  //Add it to the panel

frame.pack();  //Realize the components.
//This button will have the initial focus.
button.requestFocusInWindow(); 
frame.setVisible(true); //Display the window.