JComboBox.removeItem(Object object)

JComboBox.removeItem(Object object)

Once you addItems to JComboBox,you should also learn how to remove the same objects using JComboBox.removeItem(Object object) method.

JComboBox.removeItem(Object object) Example

[

import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.JComboBox;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JOptionPane;


public class JComboBoxRemoveItems extends JFrame implements ActionListener{
    public JButton b;
    public JComboBox box;

    public JComboBoxRemoveItems()
    {
        super("Remove JComboBox Items");
        String names []={"Eric","Mutua","James","Bill","Obama"};
        box=new JComboBox(names);

        box.setBounds(50,50,150,30);
        add(box);
        b=new JButton("Remove");
        b.setBounds(50, 100, 150, 30);
        add(b);
        b.addActionListener(this);

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

    }
    public void actionPerformed(ActionEvent event)
    {
        Object item =box.getSelectedItem();
        box.removeItem(item);
        String s=(String)item;

        JOptionPane.showMessageDialog(this,"Item remove is "+s,
                "Removing Item from JcomboBox",JOptionPane.INFORMATION_MESSAGE);

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

    }

}

]

Tips to learn from above program code

I have introduced some java.swing components in this program.These are:-

• JButton

• JOptionPane:showMessageDialog

Above class extends JFrame and implements ActionListener interface.

Note:

If you implement a certain interface you are required to override Interface abstract method i.e

[

public void actionPerformed(ActionEvent event)
{
    Object item =box.getSelectedItem();
    box.removeItem(item);
    String s=(String)item;

    JOptionPane.showMessageDialog(this,"Item remove is "+s,
            "Removing Item from JcomboBox",JOptionPane.INFORMATION_MESSAGE);

}

]

See also:

• JComboBox:addItem(Object o)

• JComboBox:addItemListener