JComboBox:addItem(Object o)

JComboBox:addItem(Object o)

There are several ways of adding Items to JComboBox.You can pass String array objects or addItems one by one.Below code shows how to add a single Item to JComboBox.

How to JComboBox:addItem(Object o)

[

import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.UIManager;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;

public class JComboBoxExample extends JFrame implements ItemListener {
    public   JComboBox box;


    JComboBoxExample()
    {
        super("JComboBox Example");
        try        {
            UIManager.setLookAndFeel
                    ("com.sun.java.swing.plaf.windows.WindowsClassicLookAndFeel");
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }




        box=new JComboBox();
        box.addItem("Java");
        box.addItem("PHP");
        box.addItem("C#");
        box.addItem("C++");
        box.addItem("Perl");
        box.addItem("Phython");


        box.setBounds(50,80,150,20);

        add(box);
        box.addItemListener(this);

        setSize(400,400);
        setLayout(null);
        setLocationRelativeTo(null);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);

    }
    public static void main(String args[])
    {
        new JComboBoxExample();

    }
    public void itemStateChanged(ItemEvent event)
    {
        String language=(String)event.getItem();
        System.out.println("Selected Programming Language is "+language);


    }



}

]

Code Explanation:

[box=new JComboBox();

        box.addItem("Java");
        box.addItem("PHP");
        box.addItem("C#");
        box.addItem("C++");
        box.addItem("Perl");

        box.addItem("Phython");]

Above is  the code that creates JComboBox and addItems to it.

Class JComboBox example extends JFrame and Implements ItemListener and that the reason why we have overriden [public void itemStateChanged(ItemEvent event)] method.

When User selects Item on JComboBox,below code is executed and prints the selected Item.[public void itemStateChanged(ItemEvent event)

{
    String language=(String)event.getItem();
    System.out.println("Selected Programming Language is "+language);

}]

UIManger sets the application look and Feel to WindowsClassicLookAndFeel

See more about Adding Items to JComboBox