![中设置组件焦点]( "中设置组件焦点")
本文介绍了在JOptionPane.showOptionDialog（）中设置组件焦点的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
为了在输入对话框中拥有自定义的按钮标题，我创建了下面的代码：
String key = null;
JTextField txtKey = new JTextField（）;
int answerKey = JOptionPane.showOptionDialog（this，new Object [] {pleaseEnterTheKey，txtKey}，decryptionKey，JOptionPane.OK_CANCEL_OPTION，JOptionPane.QUESTION_MESSAGE，null，new Object [] {okCaption，cancelCaption}，okCaption）;
if（answerKey == JOptionPane.OK_OPTION&& txtKey.getText（）！= null）{
key = txtKey.getText（）;
$ b 如何移动焦点（光标）显示对话框的文本字段？
更新
不为我工作，我的意思是textfield没有关注：
操作系统：Fedora的 - 侏儒
public class Test {
public static void main（String [] args）{
String key = null;
JTextField txtKey = new JTextField（）;
txtKey.addAncestorListener（new RequestFocusListener（））;
int answerKey = JOptionPane.showOptionDialog（null，new Object [] {Please enter the key：，txtKey}，Title，JOptionPane.OK_CANCEL_OPTION，JOptionPane.QUESTION_MESSAGE，null，new Object [] {OKKK ，CANCELLLL}，OKKK）;
if（answerKey == JOptionPane.OK_OPTION&& txtKey.getText（）！= null）{
key = txtKey.getText（）;
$ div class =h2_lin>解决方案
显示了如何轻松设置焦点在模态对话框中的任何组件。
In order to have custom button captions in an input dialog, I created the following code:
String key = null;
JTextField txtKey = new JTextField();
int answerKey = JOptionPane.showOptionDialog(this, new Object[] {pleaseEnterTheKey, txtKey}, decryptionKey, JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE, null, new Object[] {okCaption, cancelCaption}, okCaption);
if (answerKey == JOptionPane.OK_OPTION && txtKey.getText() != null) {
key = txtKey.getText();
}
How can I move the focus (cursor) to the text field as the dialog is displayed?
UPDATE
This does not work for me, I mean the textfield has no focus:OS: Fedora - Gnome
public class Test {
public static void main(String[] args) {
String key = null;
JTextField txtKey = new JTextField();
txtKey.addAncestorListener(new RequestFocusListener());
int answerKey = JOptionPane.showOptionDialog(null, new Object[]{"Please enter the key:", txtKey}, "Title", JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE, null, new Object[]{"OKKK", "CANCELLLL"}, "OKKK");
if (answerKey == JOptionPane.OK_OPTION && txtKey.getText() != null) {
key = txtKey.getText();
}
}
}
解决方案
Dialog Focus shows how you can easily set the focus on any component in a modal dialog.
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