Sushil's Blog on Programming Tutorials

Source Code:

import java.awt.Component;

import java.awt.FlowLayout;

import javax.swing.*;

import java.awt.event.*;



public class ComboDemo {

public static void main(String[] args) {

        ComboBox combo = new ComboBox();



    }

}





 class ComboBox extends JFrame implements ActionListener{

    JComboBox combo;

    JLabel lblSelected;

    JLabel lblCombo;

    final String[] comboList  = {"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};

    public ComboBox(){

        //set title of frame

        super("Example of JComboBox");

        //set layout for the frame;

        setLayout(new FlowLayout());

        //set size of the frame;

        setSize(400,200);

        //set window closing option

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //set visibility of frame;

        setVisible(true);

      

        //create label and set title/text

        lblCombo = new JLabel("Select Day: ");

        lblCombo.setVisible(true);

        //create lable

        lblSelected = new JLabel();

        lblSelected.setVisible(false);

        //create combo box;

        combo = new JComboBox();

        //set option for combo box;

        combo.setModel(new DefaultComboBoxModel(comboList));

        //add actionlistener

        combo.addActionListener(this);

        combo.setVisible(true);

      

        //add component to frame;

        add(lblCombo);

        add(combo);

        add(lblSelected);

    }



    @Override

    public void actionPerformed(ActionEvent e) {

      //return object and explicitly converted into JComboBox;

      JComboBox combo = (JComboBox) e.getSource();

      //return selected item as object and convert to string

      String day = combo.getSelectedItem().toString();

      //set text to the label;

      lblSelected.setText("Slected: " +day);

      lblSelected.setVisible(true);

    }

}