java - 如何将 keyListner 添加到 JOptionPane.showInputDialog()？

Question

我想在输入对话框上添加 keyListner。当我按下一个键时，它会给出按下的键的键码。下面是 JTextField 的完整代码，它适用于 JTextField。我通过 String n = JOptionPane.showInputDialog("enter a key") 在输入对话框上尝试了它但它说 keyListner 无法识别字符串操作。

*请编辑我的输入对话框代码

import java.awt.event.*;
import javax.swing.*;
public class KeyListnerExample extends JFrame implements KeyListener{

    String KeyCodeT = JOptionPane.showInputDialog("enter a key");//A Text Field that will display the key code.

    public KeyListnerExample(){
      KeyCodeT.addKeyListener(this);//Listens for key inputs in the text field
      KeyCodeT.setEditable(false);//disallow user input into the Text field.
      add(KeyCodeT);//add the text field to the screen
      setSize(300,300);//set the screen size
      setVisible(true);//show the window on screen.     
    }
        //Called when the key is pressed down.
    public void keyPressed(KeyEvent e){
        System.out.println("Key Pressed!!!");

        e.getKeyCode();
        System.out.println("key code is: " +e.getKeyCode());

    }

    //Called when the key is released   
    public void keyReleased(KeyEvent e){
        System.out.println("Key Released!!!");
        KeyCodeT.setText("Key Code:" + e.getKeyCode());//displays the key code in the text box

    }
    //Called when a key is typed
    public void keyTyped(KeyEvent e){


    }

     public static void main(String[] args){
      KeyListnerExample key = new KeyListnerExample();
     }

}

Answer 1

您可以尝试如下所示:

在这里，您可以通过添加 keyListener 创建一个文本字段，并且该文本字段可以传递到 JoptionPane 。

public static void main(String[] args) {
    JFrame parent = new JFrame();
    JOptionPane optionPane = new JOptionPane();
    JTextField field = getField();
    optionPane.setMessage(new Object[]{"Type something: ", field});
    optionPane.setMessageType(JOptionPane.QUESTION_MESSAGE);
    optionPane.setOptionType(JOptionPane.OK_CANCEL_OPTION);
    JDialog dialog = optionPane.createDialog(parent, "My Customized OptionPane");
    dialog.setVisible(true);

}

private static JTextField getField() {
    JTextField field = new JTextField();
    field.addKeyListener(new KeyListener() {

        @Override
        public void keyTyped(KeyEvent e) {

        }

        @Override
        public void keyPressed(KeyEvent e) {
            System.out.println("Input: " + e.getKeyChar());
        }

        @Override
        public void keyReleased(KeyEvent e) {
        }
    });
    return field;
}