Java swing: get selected value from combobox

In this tutorial, you will learn how to get selected value from combobox.

The combobox provides the list of option and let the user to choose one from  several choices. Only one option is selected at a time. In the given example, we have added the list of programming languages to the combobox using addItem() of JComboBox class. We have imposed an actionlistener on the combobox in order to get the selected value from combobox. The Itemselectable interface allow to select an option from the combobox. The method selectedString() returns the selected string.

Example:

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
class  ComboExample{

    public static void main(String[] args) throws Exception{
        JFrame f=new JFrame();
        f.setLayout(null);
        JLabel lab=new JLabel("Select Programming Language: ");
        final JComboBox combo=new JComboBox();
        combo.addItem("--Select--");
           combo.addItem("Java");
		   combo.addItem("C/C++");
		   combo.addItem(".NET");
		   combo.addItem("Perl");
           

        ActionListener actionListener = new ActionListener() {
        public void actionPerformed(ActionEvent actionEvent) {
        ItemSelectable is = (ItemSelectable)actionEvent.getSource();
        String name=selectedString(is);
        JOptionPane.showMessageDialog(null,"You have Selected: " + name);
        }
    };
       combo.addActionListener(actionListener);
        lab.setBounds(20,20,200,20);
        combo.setBounds(200,20,80,20);
        f.add(lab);
        f.add(combo);

        f.setVisible(true);
        f.setSize(300,120);
    }
    static private String selectedString(ItemSelectable is) {
    Object selected[] = is.getSelectedObjects();
    return ((selected.length == 0) ? "null" : (String)selected[0]);
  } 
}

Output:

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