创建后如何在JOptionPane中将焦点设置在特定的JTextfield上？
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我想将焦点设置在作为对象消息传递给JOptionPane的特定JTextField上。这是我的代码（我希望焦点在txt2上，但焦点始终在txt1上）：
import java.awt.*;
import java.util.*;
import javax.swing.*;
public class TextArea extends JPanel
{
private JTextArea txt1 = new JTextArea();
private JTextArea txt2 = new JTextArea();
public TextArea()
{
setLayout(null);
setPreferredSize(new Dimension(200,100));
txt1.setBounds (20, 20, 220, 20);
txt2.setBounds (20, 45, 220, 20);
txt1.setText(\"Text Field #1\");
txt2.setText(\"Text Field #2\");
add(txt1);
add(txt2);
txt2.requestFocus();
}
private void display()
{
Object[] options = {this};
JOptionPane pane = new JOptionPane();
pane.showOptionDialog(null, null, \"Title\", JOptionPane.DEFAULT_OPTION, JOptionPane.PLAIN_MESSAGE, null, options, txt2);
}
public static void main(String[] args)
{
new TextArea().display();
}
}
没有找到相关结果
已邀请:
4 个回复
倪蕊悲潍
，就可以让组件请求焦点。像这样：private JTextArea txt2 = new JTextArea() { public void addNotify() { super.addNotify(); requestFocus(); } };import java.awt.Dimension; import javax.swing.*; public class Test extends JPanel { private JTextArea txt1 = new JTextArea(); private JTextArea txt2 = new JTextArea() { public void addNotify() { super.addNotify(); requestFocus(); } }; public Test() { setLayout(null); setPreferredSize(new Dimension(200, 100)); txt1.setBounds(20, 20, 220, 20); txt2.setBounds(20, 45, 220, 20); txt1.setText(\"Text Field #1\"); txt2.setText(\"Text Field #2\"); add(txt1); add(txt2); } private void display() { Object[] options = { this }; JOptionPane pane = new JOptionPane(); pane.showOptionDialog(null, null, \"Title\", JOptionPane.DEFAULT_OPTION, JOptionPane.PLAIN_MESSAGE, null, options, txt2); } public static void main(String[] args) { new Test().display(); } }孝铜差
犀耽澄协吻
public void display2() { JDialog dialog = new JDialog(null, \"Title\", ModalityType.APPLICATION_MODAL); dialog.getContentPane().add(this); dialog.pack(); dialog.setLocationRelativeTo(null); txt2.requestFocusInWindow(); dialog.setVisible(true); }勺的驴吓识
采用txt2.addHierarchyListener(e -> { if(e.getComponent().isShowing() && (e.getChangeFlags() & HierarchyEvent.SHOWING_CHANGED) != 0) SwingUtilities.invokeLater(e.getComponent()::requestFocusInWindow); });