Displaying the Menu in a JComboBox Component Using a Keystroke

  

import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;

import javax.swing.JComboBox;

public class Main {
  public static void main(String[] argv) throws Exception {
    String[] items = { "A", "A", "B", "B", "C", "C" };
    JComboBox cb = new JComboBox(items);

    // Create and register the key listener
    cb.addKeyListener(new MyKeyListener());

  }
}

class MyKeyListener extends KeyAdapter {
  public void keyPressed(KeyEvent evt) {
    JComboBox cb = (JComboBox) evt.getSource();

    // Get pressed character
    char ch = evt.getKeyChar();

    // If not a printable character, return
    if (ch != KeyEvent.CHAR_UNDEFINED) {
      cb.showPopup();
    }
  }
}

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Displaying the Menu in a JComboBox Component Using a Keystroke : ComboBox « Swing JFC « Java

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