Source Code : Selecting Combo Sample

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Selecting Combo Sample

  
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.ItemSelectable;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.io.PrintWriter;
import java.io.StringWriter;

import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

public class SelectingComboSample {
  static private String selectedString(ItemSelectable is) {
    Object selected[] = is.getSelectedObjects();
    return ((selected.length == 0) ? "null" : (String) selected[0]);
  }

  public static void main(String args[]) {
    String labels[] = { "A", "B", "C", "D","E", "F", "G", "H","J", "I" };
    JFrame frame = new JFrame("Selecting JComboBox");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Container contentPane = frame.getContentPane();

    JComboBox comboBox = new JComboBox(labels);
    contentPane.add(comboBox, BorderLayout.SOUTH);

    final JTextArea textArea = new JTextArea();
    textArea.setEditable(false);
    JScrollPane sp = new JScrollPane(textArea);
    contentPane.add(sp, BorderLayout.CENTER);

    ItemListener itemListener = new ItemListener() {
      public void itemStateChanged(ItemEvent itemEvent) {
        StringWriter sw = new StringWriter();
        PrintWriter pw = new PrintWriter(sw);
        int state = itemEvent.getStateChange();
        String stateString = ((state == ItemEvent.SELECTED) ? "Selected": "Deselected");
        pw.print("Item: " + itemEvent.getItem());
        pw.print(", State: " + stateString);
        ItemSelectable is = itemEvent.getItemSelectable();
        pw.print(", Selected: " + selectedString(is));
        pw.println();
        textArea.append(sw.toString());
      }
    };
    comboBox.addItemListener(itemListener);

    ActionListener actionListener = new ActionListener() {
      public void actionPerformed(ActionEvent actionEvent) {
        StringWriter sw = new StringWriter();
        PrintWriter pw = new PrintWriter(sw);
        pw.print("Command: " + actionEvent.getActionCommand());
        ItemSelectable is = (ItemSelectable) actionEvent.getSource();
        pw.print(", Selected: " + selectedString(is));
        pw.println();
        textArea.append(sw.toString());
      }
    };
    comboBox.addActionListener(actionListener);

    frame.setSize(400, 200);
    frame.setVisible(true);
  }
}

           
         
    
  

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