Listening for Changes to the Selected Item in a JComboBox Component

  

import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;

import javax.swing.JComboBox;

public class Main {
  public static void main(String[] argv) throws Exception {
    String[] items = { "item1", "item2" };
    JComboBox cb = new JComboBox(items);
    cb.setEditable(true);

    MyItemListener actionListener = new MyItemListener();
    cb.addItemListener(actionListener);
  }
}

class MyItemListener implements ItemListener {
  // This method is called only if a new item has been selected.
  public void itemStateChanged(ItemEvent evt) {
    JComboBox cb = (JComboBox) evt.getSource();

    Object item = evt.getItem();

    if (evt.getStateChange() == ItemEvent.SELECTED) {
      // Item was just selected
    } else if (evt.getStateChange() == ItemEvent.DESELECTED) {
      // Item is no longer selected
    }
  }
}

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Listening for Changes to the Selected Item in a JComboBox Component : ComboBox « Swing JFC « Java

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