Java Swing - 如何處理JComboBox項目更改事件
我們想知道如何處理JComboBox項目更改事件。
import javax.swing.JList;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
public class Main {
public static void main(String[] args) {
String[] items = { "item1", "item2", "item1" };
JList<String> list = new JList<>(items);
JTextField output = new JTextField(15);
JPanel gui = new JPanel();
gui.add(list);
gui.add(output);
list.addListSelectionListener(new ListSelectionListener() {
public void valueChanged(ListSelectionEvent lse) {
int index = list.getSelectedIndex();
String outputText = "Index: " + index + " Value: " + items[index];
output.setText(outputText);
}
});
JOptionPane.showMessageDialog(null, gui);
}
}
【jcombobox】
